2500 Twelve Letter Words With Meanings From A to Z

A 12 letter word is any English word spelled with exactly twelve letters. English has more than 20,000 of them. Most belong to medicine, chemistry and taxonomy. About 130 appear regularly in ordinary writing, among them relationship, conversation and headquarters.

Most Common 12 Letter Words in English

These forty are the most frequently used twelve letter words in English, ranked by frequency of use in everyday speech and writing.

• Relationship
• Conversation
• Professional
• Neighborhood
• Unbelievable
• Intelligence
• Disappointed
• Embarrassing
• Particularly
• Commissioner
• Construction
• Surveillance
• Headquarters
• Organization
• Instructions
• Consequences
• Fingerprints
• Thanksgiving
• Specifically
• Announcement
• Photographer
• Arrangements
• Instrumental
• Accidentally
• Mademoiselle
• Civilization
• Psychiatrist
• Presentation
• Accomplished
• Championship
• Independence
• Transmission
• Congratulate
• Interrupting
• Prescription
• Deliberately
• Confidential
• Occasionally
• Investigator
• Satisfaction

Every 12 Letter Word From A to Z

Every word here has been checked at exactly twelve letters and against an English dictionary. Within each letter, the more common words come first and the technical ones follow. For neighbouring lengths, see 11 letter words and 13 letter words.

12 Letter Words Starting With A

• Abbreviation
• Abolitionist
• Abominations
• Absentminded
• Absoluteness
• Abstractions
• Academically
• Academicians
• Accelerating
• Acceleration
• Accelerators
• Accentuating
• Accessorized
• Accidentally
• Acclimatized
• Accommodated
• Accommodates
• Accompanying
• Accomplished
• Accomplishes
• Accordionist
• Accoutrement
• Accumulating
• Accumulation
• Accumulators
• Achievements
• Acknowledged
• Acknowledges
• Acoustically
• Acquaintance
• Acquiescence
• Acquisitions
• Adaptability
• Additionally
• Adjudication
• Administered
• Administrate
• Adulteration
• Advancements
• Advantageous
• Aerodynamics
• Aeronautical
• Affectations
• Affectionate
• Affiliations
• Affirmations
• Aforethought
• Afterburners
• Aftereffects
• Afterthought
• Aggressively
• Agribusiness
• Agricultural
• Alliteration
• Alphabetical
• Alphabetized
• Alphanumeric
• Altercations
• Alternatives
• Amalgamation
• Ambidextrous
• Americanized
• Amortization
• Amphetamines
• Amphitheater
• Amphitheatre
• Amphotericin
• Anachronisms
• Anaesthetics
• Anaesthetist
• Anaphylactic
• Anatomically
• Anesthetized
• Annihilating
• Annihilation
• Announcement
• Annunciation
• Antagonistic
• Antagonizing
• Antediluvian
• Anthropology
• Antiaircraft
• Anticipating
• Anticipation
• Anticipatory
• Antifascists
• Antioxidants
• Antithetical
• Aphrodisiacs
• Apothecaries
• Appalachians
• Appendectomy
• Appendicitis
• Appertaining
• Applications
• Appointments
• Appreciating
• Appreciation
• Appreciative
• Apprehending
• Apprehension
• Apprehensive
• Apprenticing
• Approachable
• Appropriated
• Approximated
• Approximates
• Archeologist
• Architecture
• Argentineans
• Aristocratic
• Aristotelian
• Arithmetical
• Arraignments
• Arrangements
• Articulating
• Articulation
• Artificially
• Artilleryman
• Artillerymen
• Artistically
• Ascertaining
• Asphyxiating
• Asphyxiation
• Assassinated
• Assassinates
• Assassinator
• Assignations
• Assimilating
• Assimilation
• Associations
• Astonishment
• Astoundingly
• Astrobiology
• Astrological
• Astronomical
• Astrophysics
• Asymmetrical
• Asymptomatic
• Athletically
• Atmospherics
• Attractively
• Attributable
• Augmentation
• Auspiciously
• Authenticate
• Authenticity
• Autographing
• Autonomously
• Availability

12 Letter Words Starting With B

• Bacchanalian
• Bachelorette
• Bachelorhood
• Backbenchers
• Backbreaking
• Backlighting
• Backpedaling
• Backslapping
• Backstabbing
• Backstopping
• Backtracking
• Backwardness
• Bacteriology
• Bandersnatch
• Bankruptcies
• Bantamweight
• Barbiturates
• Barnstorming
• Basilosaurus
• Battlefields
• Battleground
• Beachcombers
• Beachcombing
• Bedfordshire
• Begrudgingly
• Behaviorally
• Behaviorists
• Belligerence
• Belligerents
• Bellybuttons
• Benefactress
• Benevolently
• Bespectacled
• Bewilderment
• Bibliography
• Bicentennial
• Billingsgate
• Billionaires
• Biochemistry
• Biographical
• Biologically
• Biomechanics
• Blabbermouth
• Blackballing
• Blackberries
• Blackcurrant
• Blacklisting
• Blackmailers
• Blackmailing
• Blatherskite
• Blindfolding
• Blockbusters
• Bloodletting
• Bloodstained
• Bloodstreams
• Bloodsuckers
• Bloodsucking
• Bloodthirsty
• Bodybuilders
• Bodybuilding
• Boilermakers
• Boisterously
• Bombardments
• Boutonnieres
• Brainwashing
• Breadwinners
• Breakfasting
• Breakthrough
• Breastplates
• Breaststroke
• Breathlessly
• Breathtaking
• Brilliantine
• Brinkmanship
• Broadcasters
• Broadcasting
• Bronchoscopy
• Bronchospasm
• Brontosaurus
• Buccaneering
• Bullfighters
• Bullfighting
• Bullshitting
• Bureaucratic
• Burglarizing
• Bushwhackers
• Bushwhacking
• Businesslike
• Butterscotch
• Byelorussian

12 Letter Words Starting With C

• Calculations
• Californians
• Calisthenics
• Calligrapher
• Cancellation
• Candlesticks
• Cantankerous
• Capabilities
• Capitalistic
• Capitulation
• Carbohydrate
• Carcinogenic
• Cardiologist
• Carelessness
• Carpetbagger
• Carthaginian
• Cartographer
• Catastrophes
• Catastrophic
• Caterpillars
• Caterwauling
• Celebrations
• Centerpieces
• Certificates
• Chairmanship
• Chambermaids
• Championship
• Characterise
• Characterize
• Chauffeuring
• Chauvinistic
• Checkerboard
• Cheerfulness
• Cheerleaders
• Cheerleading
• Cheeseburger
• Chemotherapy
• Chesterfield
• Childbearing
• Childishness
• Chiropractic
• Chiropractor
• Choreography
• Christianity
• Churchwarden
• Circumcision
• Circumstance
• Circumvented
• Civilisation
• Civilization
• Clairvoyance
• Cobblestones
• Cockfighting
• Cohabitation
• Coincidences
• Coincidental
• Collaborated
• Collaborator
• Collectibles
• Collectively
• Colonisation
• Colonization
• Combinations
• Commandeered
• Commandments
• Commemorated
• Commemorates
• Commencement
• Commendation
• Commensurate
• Commentaries
• Commentators
• Commercially
• Commissariat
• Commissioned
• Commissioner
• Commonwealth
• Communicable
• Communicated
• Communicates
• Communicator
• Compartments
• Compensating
• Compensation
• Compensatory
• Competitions
• Complemented
• Completeness
• Complexities
• Complicating
• Complication
• Complimented
• Compositions
• Compressions
• Compromising
• Compulsively
• Computations
• Computerized
• Concentrated
• Concentrates
• Conceptually
• Conciliation
• Conclusively
• Concurrently
• Condemnation
• Condensation
• Conditioners
• Conditioning
• Condominiums
• Conductivity
• Confectioner
• Confederates
• Confessional
• Confidential
• Confirmation
• Confiscating
• Confiscation
• Congeniality
• Conglomerate
• Congratulate
• Congregating
• Congregation
• Connectivity
• Connoisseurs
• Connotations
• Conquistador
• Conscription
• Consecration
• Consequences
• Consequently
• Conservation
• Conservatism
• Conservative
• Conservatory
• Considerable
• Considerably
• Consistently
• Consolidated
• Conspiracies
• Conspirators
• Constabulary
• Constipation
• Constituency
• Constituents
• Constitution
• Constricting
• Constriction
• Constrictors
• Constructing
• Construction
• Constructive
• Consultation
• Consummation
• Contaminants
• Contaminated
• Contemplated
• Contemplates
• Contemporary
• Contemptible
• Contemptuous
• Continuation
• Continuously
• Contractions
• Contradicted
• Contraptions
• Contributing
• Contribution
• Contributors
• Controllable
• Convalescent
• Convalescing
• Conveniences
• Conveniently
• Conventional
• Conversation
• Convertibles
• Convincingly
• Cooperatives
• Coordinating
• Coordination
• Coordinators
• Cornerstones
• Corporations
• Correctional
• Corresponded
• Corroborated
• Corroborates
• Cosmological
• Cosmologists
• Cosmopolitan
• Councilwoman
• Counterfeits
• Counteroffer
• Counterparts
• Counterpoint
• Courageously
• Crisscrossed
• Cryptography
• Crystallized
• Czechoslovak

12 Letter Words Starting With D

• Deactivating
• Deactivation
• Debilitating
• Decapitating
• Decapitation
• Decelerating
• Deceleration
• Decisiveness
• Declarations
• Declassified
• Decommission
• Decompressed
• Decongestant
• Defibrillate
• Deficiencies
• Definitively
• Deformations
• Degenerating
• Degeneration
• Degenerative
• Dehumanizing
• Dehumidifier
• Deliberately
• Deliberating
• Deliberation
• Delicatessen
• Delightfully
• Demagnetized
• Demographics
• Demonstrable
• Demonstrably
• Demonstrated
• Demonstrates
• Demonstrator
• Demoralising
• Demoralizing
• Denomination
• Denominators
• Denouncement
• Denunciation
• Departmental
• Dependencies
• Depopulation
• Deportations
• Depreciating
• Depreciation
• Depressingly
• Depressurize
• Deprivations
• Deregulation
• Desalination
• Descriptions
• Desensitized
• Designations
• Desirability
• Destabilized
• Destinations
• Destructions
• Deteriorated
• Deteriorates
• Developments
• Diabolically
• Diamondbacks
• Dictatorship
• Dictionaries
• Diethylamide
• Differential
• Difficulties
• Directorship
• Disabilities
• Disadvantage
• Disagreeable
• Disagreement
• Disappearing
• Disappointed
• Disapproving
• Disassembled
• Disassociate
• Disastrously
• Disbelievers
• Disbelieving
• Disbursement
• Disciplinary
• Disciplining
• Discomfiture
• Disconcerted
• Disconnected
• Disconsolate
• Discontented
• Discontinued
• Discordantly
• Discotheques
• Discouraging
• Discourteous
• Discrediting
• Discriminate
• Disembarking
• Disemboweled
• Disenchanted
• Disgustingly
• Disheartened
• Dishonorable
• Dishonorably
• Dishonouring
• Disinfectant
• Disinfecting
• Disinfection
• Disingenuous
• Disinherited
• Disintegrate
• Dislocations
• Dismembering
• Disobedience
• Disorganised
• Disorganized
• Disorienting
• Dispensaries
• Dispensation
• Displacement
• Dispositions
• Dispossessed
• Disqualified
• Disqualifies
• Disregarding
• Disreputable
• Dissatisfied
• Disseminated
• Dissertation
• Dissociation
• Dissociative
• Distillation
• Distilleries
• Distinctions
• Distractions
• Distributing
• Distribution
• Distributors
• Disturbances
• Disturbingly
• Diversifying
• Diversionary
• Dodecahedron
• Domestically
• Domesticated
• Doppelganger
• Doubleheader
• Downloadable
• Dramatically
• Dreadnoughts
• Dysfunctions

12 Letter Words Starting With E

• Earthshaking
• Eavesdropped
• Eavesdropper
• Eccentricity
• Ecclesiastes
• Ecclesiastic
• Echolocation
• Ecologically
• Economically
• Ecstatically
• Edaphosaurus
• Editorialize
• Effeminately
• Effervescent
• Efficiencies
• Effortlessly
• Egyptologist
• Electrically
• Electricians
• Electrifying
• Electrocuted
• Electrocutes
• Electrolysis
• Electrolytes
• Electrolytic
• Electroscope
• Electroshock
• Eliminations
• Emancipating
• Emancipation
• Emasculating
• Emasculation
• Embarrassing
• Embellishing
• Embezzlement
• Embolization
• Embroideries
• Embroidering
• Emotionalism
• Emotionality
• Emphatically
• Emplacements
• Encapsulated
• Encapsulates
• Encephalitis
• Enchantments
• Encirclement
• Encompassing
• Encountering
• Encroachment
• Encumbrances
• Encyclopedia
• Encyclopedic
• Endangerment
• Endeavouring
• Endocarditis
• Endorsements
• Endoskeleton
• Endotracheal
• Englishwoman
• Enhancements
• Enlargements
• Enlightening
• Entanglement
• Enterprising
• Entertainers
• Entertaining
• Enthronement
• Enthusiastic
• Entomologist
• Entrenchment
• Entrepreneur
• Environments
• Epidemiology
• Episcopalian
• Epistemology
• Equalization
• Equivocation
• Erythromycin
• Establishing
• Estrangement
• Ethnographic
• Evangelicals
• Evidentially
• Eviscerating
• Evisceration
• Evolutionary
• Evolutionist
• Exacerbating
• Exaggerating
• Exaggeration
• Examinations
• Exasperating
• Exasperation
• Excellencies
• Exclamations
• Exclusionary
• Excruciating
• Executioners
• Exfiltration
• Exhaustively
• Exhilarating
• Exhilaration
• Expansionist
• Expectations
• Expenditures
• Experiencing
• Experiential
• Experimental
• Experimented
• Experimenter
• Explanations
• Exploitation
• Exploitative
• Explorations
• Expropriated
• Exsanguinate
• Exterminated
• Exterminator
• Extinguished
• Extinguisher
• Extinguishes
• Extortionate
• Extortionist
• Extramarital
• Extrapolated
• Extrasensory
• Extravagance
• Extravaganza
• Eyewitnesses

12 Letter Words Starting With F

• Fabrications
• Fabulousness
• Facilitating
• Facilitation
• Factionalism
• Fainthearted
• Faithfulness
• Familiarised
• Familiarized
• Fascinations
• Fastidiously
• Favorability
• Fearlessness
• Featherbrain
• Feebleminded
• Felicitating
• Felicitation
• Feminization
• Fenestration
• Fermentation
• Ferrocyanide
• Fibrillating
• Fibrillation
• Fictionalize
• Fictitiously
• Fiddlesticks
• Figuratively
• Filibustered
• Finalization
• Fingerprints
• Firecrackers
• Firefighters
• Firefighting
• Fireproofing
• Flagellating
• Flagellation
• Flamboyantly
• Flamethrower
• Flammability
• Flatteringly
• Fleetingness
• Flimflamming
• Flocculation
• Fluctuations
• Fluorescence
• Fluoridation
• Fluorocarbon
• Fluoroscoped
• Fluoroscopic
• Fluphenazine
• Folliculitis
• Footsoldiers
• Foraminifera
• Forbiddingly
• Forcefulness
• Foreclosures
• Forensically
• Foreordained
• Foreshadowed
• Forestalling
• Formaldehyde
• Formlessness
• Formulations
• Forthrightly
• Fortuitously
• Foundational
• Fountainhead
• Fractionally
• Frankenstein
• Frankfurters
• Frankincense
• Fraternising
• Fraternities
• Fraternizing
• Fraudulently
• Freakishness
• Freestanding
• Freethinkers
• Freethinking
• Freewheeling
• Frenetically
• Frictionless
• Friendliness
• Frontiersman
• Frontiersmen
• Frontispiece
• Fruitfulness
• Frustrations
• Functionally
• Fundamentals

12 Letter Words Starting With G

• Galactically
• Galactorrhea
• Gallbladders
• Gallivanting
• Galvanometer
• Gamesmanship
• Gasification
• Gastroplasty
• Gatecrashers
• Gemeinschaft
• Genealogical
• Genealogists
• Generalising
• Generalities
• Generalizing
• Generational
• Generosities
• Genuflecting
• Genuflection
• Geochemistry
• Geographical
• Geologically
• Geomagnetism
• Geophysicist
• Geopolitical
• Geostrategic
• Geriatrician
• Gesellschaft
• Ghostwriters
• Ghostwriting
• Ghostwritten
• Gigantically
• Glaciologist
• Gladiatorial
• Glassblowers
• Glassblowing
• Globetrotter
• Glockenspiel
• Gloriousness
• Glossophobia
• Glossopteris
• Glycoprotein
• Gobbledegook
• Gobbledygook
• Goddamnedest
• Goddaughters
• Gonadotropin
• Gooseberries
• Gorgeousness
• Gossipmonger
• Governmental
• Governorship
• Gracefulness
• Graciousness
• Gradualistic
• Granddaddies
• Grandfathers
• Grandmontine
• Grandmothers
• Grandparents
• Grandstander
• Graphologist
• Graphomaniac
• Grasshoppers
• Gratefulness
• Gratifyingly
• Gratuitously
• Gravediggers
• Greengrocers
• Greengrocery
• Greenskeeper
• Griddlecakes
• Grotesquerie
• Groundkeeper
• Groundlessly
• Guaranteeing
• Guardianship
• Guttersnipes
• Gynecologist
• Gynecomastia

12 Letter Words Starting With H

• Haberdashery
• Habitability
• Haemophiliac
• Haemorrhaged
• Haemorrhagic
• Haemorrhoids
• Hairdressers
• Hairdressing
• Hallucinated
• Hallucinates
• Hallucinogen
• Handicapping
• Handkerchief
• Handsomeness
• Happenstance
• Harbormaster
• Hardscrabble
• Harmoniously
• Hasenpfeffer
• Headmistress
• Headquarters
• Headshrinker
• Heartbreaker
• Heartrending
• Heartstrings
• Heartwarming
• Heavyweights
• Helplessness
• Hematologist
• Hemodialysis
• Hemophiliacs
• Hemorrhaging
• Hemorrhoidal
• Henceforward
• Hermetically
• Heterosexual
• Hierarchical
• Hieroglyphic
• Highlighting
• Hindquarters
• Hippopotamus
• Histological
• Historically
• Hohenzollern
• Homelessness
• Homesickness
• Homesteaders
• Honeymooners
• Honeymooning
• Hootenannies
• Hopelessness
• Horizontally
• Hornswoggled
• Horrendously
• Horribleness
• Horrifically
• Horrifyingly
• Horsemanship
• Horsewhipped
• Horticulture
• Hospitalized
• Housebreaker
• Householders
• Househusband
• Housekeepers
• Housekeeping
• Housesitting
• Housewarming
• Humanitarian
• Humiliations
• Hummingbirds
• Hydrocarbons
• Hydrochloric
• Hydrodynamic
• Hydrofluoric
• Hydrogenated
• Hydrographic
• Hydrological
• Hydrotherapy
• Hydrothermal
• Hygienically
• Hyperkalemia
• Hypertension
• Hypertensive
• Hyperthermia
• Hypertrophic
• Hypnotherapy
• Hypnotically
• Hypochlorite
• Hypochondria
• Hypocritical
• Hypoglycemia
• Hypoglycemic
• Hyponatremia
• Hypothalamic
• Hypothalamus
• Hypothesized
• Hypothetical
• Hysterectomy
• Hysterically

12 Letter Words Starting With I

• Identifiable
• Illegitimate
• Illuminating
• Illumination
• Illusionists
• Illustrating
• Illustration
• Imaginations
• Immaculately
• Immeasurable
• Immeasurably
• Immortalised
• Immortalized
• Immunization
• Impartiality
• Impenetrable
• Imperfection
• Imperialists
• Imperishable
• Impermanence
• Impersonated
• Impersonates
• Impersonator
• Impertinence
• Implantation
• Implementing
• Implications
• Impoverished
• Impregnating
• Impressively
• Imprisonment
• Improvements
• Inaccessible
• Inaccuracies
• Inadequacies
• Inadmissible
• Inarticulate
• Inaugurating
• Inauguration
• Inauspicious
• Incalculable
• Incandescent
• Incantations
• Incapacitate
• Incarcerated
• Incarnations
• Incendiaries
• Incidentally
• Incinerating
• Incineration
• Inclinations
• Incoherently
• Incomparable
• Incomparably
• Incompatible
• Incompetence
• Incompetents
• Inconclusive
• Inconsistent
• Inconsolable
• Incontinence
• Inconvenient
• Incorporated
• Incorporates
• Incorrigible
• Increasingly
• Incriminated
• Incriminates
• Indebtedness
• Indefensible
• Indefinitely
• Indentations
• Independence
• Independents
• Indianapolis
• Indifference
• Indigestible
• Indiscipline
• Indiscretion
• Indisputable
• Indistinctly
• Individually
• Indoctrinate
• Inefficiency
• Inequalities
• Inexperience
• Inexplicable
• Inexplicably
• Inextricably
• Infidelities
• Infiltrating
• Infiltration
• Infiltrators
• Inflammation
• Inflammatory
• Inflationary
• Infrequently
• Infringement
• Ingratiating
• Inhospitable
• Initializing
• Inoculations
• Inordinately
• Inscriptions
• Insecticides
• Insecurities
• Insemination
• Insinuations
• Inspectorate
• Inspirations
• Installation
• Installments
• Institutions
• Instructions
• Instrumental
• Insufferable
• Insufficient
• Insurrection
• Intellectual
• Intelligence
• Intelligible
• Intensifying
• Interactions
• Intercepting
• Interception
• Interceptors
• Intercession
• Interdiction
• Interference
• Interlocking
• Intermediary
• Intermediate
• Interminable
• Intermingled
• Intermission
• Intermittent
• Internalized
• Interpreters
• Interpreting
• Interpretive
• Interrogated
• Interrogates
• Interrogator
• Interrupting
• Interruption
• Intersecting
• Intersection
• Interspecies
• Interspersed
• Interstellar
• Interstitial
• Intervention
• Interviewing
• Intimidating
• Intimidation
• Intoxicating
• Intoxication
• Intracranial
• Intransigent
• Introduction
• Introductory
• Invertebrate
• Investigated
• Investigates
• Investigator
• Invigorating
• Invisibility
• Invitational
• Invulnerable
• Irrationally
• Irredeemable
• Irregardless
• Irregularity
• Irresistible
• Irresistibly
• Irrespective
• Irreversible
• Irreversibly
• Irritability
• Isolationist

12 Letter Words Starting With J

English has only 68 twelve letter words beginning with J. Jurisdiction and journalistic are the two in general use.

• Jacksonville
• Japanization
• Jeffersonian
• Jeopardising
• Jeopardizing
• Jesuitically
• Jitterbugged
• Jitterbugger
• Johannesburg
• Journalistic
• Jurisconsult
• Jurisdiction
• Juristically
• Justiciaries
• Juvenescence

12 Letter Words Starting With K

K produces roughly 104 words at this length. Kindergarten and kaleidoscope are the two in common use.

• Kaleidoscope
• Katzenjammer
• Keynesianism
• Kindergarten
• Kirschwasser
• Kitchenettes
• Kleptomaniac
• Klipspringer
• Kneecappings
• Knowledgable
• Knowledgably
• Knucklebones
• Knuckleheads
• Kommandatura
• Konstantinos

12 Letter Words Starting With L

• Laboratories
• Laboursaving
• Labyrinthian
• Labyrinthine
• Lallygagging
• Lamentations
• Landholdings
• Languorously
• Laparotomies
• Laryngectomy
• Laryngoscope
• Laryngoscopy
• Laryngospasm
• Lasciviously
• Laughability
• Laundrywoman
• Leapfrogging
• Leaseholders
• Leathernecks
• Lechuguillas
• Legalization
• Legionnaires
• Legislatures
• Legitimately
• Legitimation
• Legitimising
• Legitimizing
• Leukocytosis
• Lexicography
• Liberalising
• Liberalistic
• Liberalizing
• Libertarians
• Lifelessness
• Lighthearted
• Lightweights
• Lilliputians
• Lincolnesque
• Liquefaction
• Liquefactive
• Liquidations
• Listenership
• Listlessness
• Lithographer
• Lithographic
• Liverpudlian
• Loansharking
• Lobotomizing
• Localisation
• Localization
• Locksmithery
• Locksmithing
• Loganberries
• Logistically
• Lollapalooza
• Lollygagging
• Lonesomeness
• Longitudinal
• Longshoreman
• Longshoremen
• Longstanding
• Loudspeakers
• Lovelessness
• Lovesickness
• Luminescence
• Luminiferous
• Luncheonette
• Lusciousness
• Lycanthropia
• Lycanthropic

12 Letter Words Starting With M

• Macclesfield
• Machinations
• Mademoiselle
• Magnetically
• Magnetometer
• Magnificence
• Maidservants
• Majestically
• Malformation
• Malfunctions
• Malnourished
• Malnutrition
• Maltreatment
• Maneuverable
• Manipulating
• Manipulation
• Manipulative
• Manipulators
• Manslaughter
• Manufactured
• Manufacturer
• Manufactures
• Marketplaces
• Marksmanship
• Marriageable
• Marseillaise
• Marshmallows
• Marshmallowy
• Marvellously
• Masquerading
• Mastectomies
• Masterminded
• Masterpieces
• Masterstroke
• Masturbating
• Masturbation
• Materialised
• Materialists
• Materialized
• Materializes
• Mathematical
• Matriculated
• Meaningfully
• Measurements
• Mechanically
• Mediocrities
• Megalomaniac
• Melodramatic
• Memorialized
• Memorization
• Menstruating
• Menstruation
• Mesopotamian
• Mesothelioma
• Metabolizing
• Metallurgist
• Metalworkers
• Metalworking
• Metamorphose
• Metaphorical
• Metaphysical
• Metastasized
• Methacrylate
• Methodically
• Methotrexate
• Meticulously
• Metropolises
• Metropolitan
• Michelangelo
• Microbiology
• Microcircuit
• Microclimate
• Microseconds
• Microsurgery
• Microsystems
• Middleweight
• Militaristic
• Millionaires
• Milliseconds
• Mimeographed
• Mineralogist
• Minesweepers
• Miniaturized
• Minimization
• Miraculously
• Misadventure
• Misalignment
• Misanthropic
• Misbehaviour
• Miscalculate
• Miscarriages
• Misconstrued
• Misdemeanors
• Misdemeanour
• Misdiagnosed
• Misdiagnosis
• Misdirection
• Misericordia
• Misfortunate
• Misinterpret
• Misjudgement
• Misogynistic
• Mispronounce
• Misrepresent
• Missionaries
• Misspellings
• Mistreatment
• Mitochondria
• Mobilisation
• Mobilization
• Mockingbirds
• Modification
• Moisturizers
• Moisturizing
• Moneylenders
• Monkeyshines
• Monofilament
• Monopolising
• Monopolistic
• Monopolizing
• Monosyllabic
• Monosyllable
• Monotheistic
• Monotonously
• Monumentally
• Moonlighting
• Motivational
• Motorboating
• Motorcycling
• Motorcyclist
• Mountaineers
• Mountainside
• Mountaintops
• Mulligatawny
• Multicolored
• Multifaceted
• Multifarious
• Multilayered
• Multilingual
• Multimillion
• Multiplicity
• Multipurpose
• Multitasking
• Multivariate
• Multivitamin
• Municipality
• Musicianship
• Musicologist
• Mysteriously
• Mythological

12 Letter Words Starting With N

• Narcissistic
• Nationalists
• Nationalized
• Naturalistic
• Naturopathic
• Nauseatingly
• Nauseousness
• Navigational
• Neanderthals
• Necessitated
• Necessitates
• Neckerchiefs
• Necromancers
• Necrophagous
• Necrophiliac
• Needlepoints
• Negotiations
• Neighborhood
• Neighbouring
• Neoclassical
• Nephrologist
• Neurasthenia
• Neurasthenic
• Neuroanatomy
• Neurobiology
• Neurochemist
• Neurogenesis
• Neurographic
• Neurological
• Neurologists
• Neuroscience
• Neurosurgeon
• Neurosurgery
• Neurotically
• Neutralizing
• Nevertheless
• Newfoundland
• Newsmagazine
• Newspaperman
• Newspapermen
• Nickelodeons
• Nightclothes
• Nightcrawler
• Nightingales
• Nightwalkers
• Nimbostratus
• Nitromethane
• Nomenclature
• Nonaddictive
• Nonalcoholic
• Nonbelievers
• Noncancerous
• Nonchalantly
• Noncombatant
• Noncombative
• Noncommittal
• Noncompliant
• Nonconductor
• Noncustodial
• Nonemotional
• Nonessential
• Nonexclusive
• Nonexistence
• Nonflammable
• Nonintuitive
• Nonpolitical
• Nonpolluting
• Nonreligious
• Nonrenewable
• Nonsectarian
• Nonviolently
• Noradrenalin
• Normotensive
• Northeastern
• Northernmost
• Northumbrian
• Northwestern
• Notabilities
• Notification
• Nourishments
• Novelisation
• Novelization
• Numerologist
• Nutritionist
• Nymphomaniac

12 Letter Words Starting With O

• Objectifying
• Obliterating
• Obliteration
• Obscurantism
• Obscurantist
• Observations
• Obsolescence
• Obstetrician
• Obstreperous
• Obstructions
• Occasionally
• Occupational
• Oceanography
• Octogenarian
• Odontologist
• Omnipresence
• Onomatopoeia
• Oophorectomy
• Operatically
• Opportunists
• Oppositional
• Oppressively
• Optimization
• Optometrists
• Orchestrated
• Orchestrates
• Orchestrator
• Ordinariness
• Organisation
• Organization
• Orientations
• Orienteering
• Ornithomimus
• Orthodontics
• Orthodontist
• Orthographic
• Orthopaedics
• Orthopaedist
• Orthopedists
• Oscillations
• Oscillograph
• Oscilloscope
• Ossification
• Ostentatious
• Osteogenesis
• Osteological
• Osteoporosis
• Osteosarcoma
• Otherworldly
• Outbuildings
• Outcroppings
• Outdistanced
• Outmanoeuvre
• Outnumbering
• Outperformed
• Outrageously
• Outstandings
• Outstretched
• Outstripping
• Overachiever
• Overburdened
• Overcautious
• Overcharging
• Overcrowding
• Overdramatic
• Overeducated
• Overestimate
• Overexerting
• Overexertion
• Overexposure
• Overextended
• Overgenerous
• Overindulged
• Overinflated
• Overlordship
• Overnighters
• Overpopulate
• Overpowering
• Overpressure
• Overproduced
• Overreaching
• Overreacting
• Overreaction
• Overshadowed
• Overshooting
• Oversimplify
• Oversleeping
• Overspending
• Overstepping
• Overstrained
• Overstressed
• Overthrowing
• Overtraining
• Overwhelming
• Oxyacetylene

12 Letter Words Starting With P

P starts more twelve letter words than any other letter, over 3,400, mostly through the prefixes pre-, pro-, poly- and photo-.

• Pacification
• Paintbrushes
• Paleontology
• Palestinians
• Palpitations
• Pancreatitis
• Paperweights
• Parachutists
• Paramilitary
• Paraphrasing
• Paratroopers
• Parishioners
• Parsimonious
• Participants
• Participated
• Participates
• Particularly
• Partnerships
• Passionately
• Pathetically
• Pathological
• Pathologists
• Peacefulness
• Peacekeepers
• Peacekeeping
• Peccadilloes
• Pediatrician
• Penitentiary
• Pennsylvania
• Perforations
• Performances
• Pericarditis
• Periodically
• Periodontist
• Peripherally
• Permanganate
• Permutations
• Perpetrating
• Perpetrators
• Perpetuating
• Perpetuation
• Persecutions
• Perseverance
• Persistently
• Personalized
• Perspectives
• Perspicacity
• Perspiration
• Persuasively
• Perturbation
• Pestilential
• Pharmacology
• Phenomenally
• Philadelphia
• Philandering
• Philanthropy
• Philharmonic
• Philosophers
• Philosophies
• Philosophize
• Phonetically
• Photocopying
• Photographed
• Photographer
• Photographic
• Physiologist
• Piggybacking
• Pigmentation
• Plagiarizing
• Plainclothes
• Platonically
• Plausibility
• Pleasantries
• Pneumothorax
• Polarization
• Poltergeists
• Polyethylene
• Polyurethane
• Pomegranates
• Pornographer
• Pornographic
• Postgraduate
• Posthumously
• Posthypnotic
• Postmistress
• Postponement
• Potentiality
• Practicality
• Practitioner
• Praiseworthy
• Precariously
• Preciousness
• Precipitated
• Precipitates
• Precognition
• Preconceived
• Precondition
• Predecessors
• Predicaments
• Predilection
• Preemptively
• Preferential
• Premeditated
• Premenstrual
• Premonitions
• Preoperative
• Preparations
• Preparedness
• Prepositions
• Preposterous
• Prepubescent
• Prerequisite
• Prerogatives
• Presbyterian
• Preschoolers
• Prescription
• Presentation
• Presentiment
• Preservation
• Preservative
• Presidential
• Pressurizing
• Presumptions
• Presumptuous
• Preventative
• Principality
• Prizefighter
• Prizewinning
• Probationary
• Probationers
• Processional
• Proclamation
• Proclivities
• Proctologist
• Prodigiously
• Productively
• Productivity
• Professional
• Professorial
• Profiteering
• Progesterone
• Programmable
• Progressions
• Progressives
• Prohibitions
• Proletarians
• Prolongation
• Proofreading
• Propagandist
• Prophylactic
• Proportional
• Proportioned
• Propositions
• Proprietress
• Prosecutions
• Prostituting
• Prostitution
• Protagonists
• Protectorate
• Prototypical
• Protuberance
• Providential
• Provisioning
• Provocateurs
• Provocations
• Psychedelics
• Psychiatrist
• Psychoactive
• Psychologist
• Psychopathic
• Psychosexual
• Psychotropic
• Pterodactyls
• Publications
• Pumpernickel
• Purification
• Purposefully
• Pussyfooting
• Putrefaction
• Pyrotechnics

12 Letter Words Starting With Q

Every twelve letter Q word has a U straight after it. The quadr- and quinqu- number prefixes produce most of the 126 that exist.

• Quadrangular
• Quadraphonic
• Quadrillions
• Quadriplegia
• Quadriplegic
• Quantifiable
• Quantitative
• Quantization
• Quarantining
• Quarterbacks
• Quarterfinal
• Quarterstaff
• Quattrocento
• Questionable
• Questionably
• Questionings
• Quetzalcoatl
• Quinquennium
• Quintessence
• Quintillions

12 Letter Words Starting With R

• Racketeering
• Radiographer
• Radioisotope
• Radiological
• Radiologists
• Radiotherapy
• Rambunctious
• Rapscallions
• Ratification
• Rationalized
• Rattlesnakes
• Reacquainted
• Reactivating
• Reactivation
• Readjustment
• Realizations
• Reallocation
• Reappearance
• Reassembling
• Reassessment
• Reassignment
• Reassurances
• Reassuringly
• Reattachment
• Recalcitrant
• Recalculated
• Recalibrated
• Recapitulate
• Receivership
• Receptionist
• Rechargeable
• Rechristened
• Reciprocated
• Recklessness
• Reclassified
• Recognisable
• Recognizable
• Recognizance
• Recollecting
• Recollection
• Recommending
• Recommitment
• Reconfigured
• Reconnecting
• Reconnection
• Reconsidered
• Reconstitute
• Reconstructs
• Recreational
• Recuperating
• Recuperation
• Recuperative
• Redecorating
• Redecoration
• Redeployment
• Redeveloping
• Rediscovered
• Redistribute
• Redundancies
• Reenactments
• Reevaluating
• Reevaluation
• Refreshingly
• Refreshments
• Refrigerated
• Refrigerator
• Refurbishing
• Regenerating
• Regeneration
• Regenerative
• Registration
• Regurgitated
• Rehabilitate
• Reincarnated
• Reinitialize
• Reintegrated
• Reintroduced
• Reinvestment
• Reinvigorate
• Rejuvenating
• Rejuvenation
• Relationship
• Relativistic
• Relentlessly
• Relinquished
• Relinquishes
• Remembrances
• Reminiscence
• Remuneration
• Rendezvoused
• Renegotiated
• Renunciation
• Reoccurrence
• Reorganising
• Reorganizing
• Repatriation
• Repercussion
• Repetitively
• Replacements
• Replenishing
• Repopulating
• Repopulation
• Repositioned
• Repositories
• Repossessing
• Repossession
• Representing
• Reprimanding
• Reprocessing
• Reproducible
• Reproduction
• Reproductive
• Reprogrammed
• Requirements
• Requisitions
• Rescheduling
• Resemblances
• Resequencing
• Reservations
• Resettlement
• Resignations
• Resoundingly
• Respectfully
• Respectively
• Respirations
• Restaurateur
• Restlessness
• Restorations
• Restrictions
• Restructured
• Resurrecting
• Resurrection
• Resuscitated
• Resuscitator
• Retaliations
• Retrofitting
• Reverberated
• Reverberates
• Revisionists
• Revitalizing
• Rhetorically
• Rhinoceroses
• Rhododendron
• Rhythmically
• Ridiculously
• Risorgimento
• Romantically
• Romanticized
• Roughhousing
• Ruthlessness

12 Letter Words Starting With S

• Sacrilegious
• Sadistically
• Safecracking
• Safeguarding
• Salesmanship
• Salutatorian
• Sandblasting
• Sarsaparilla
• Saskatchewan
• Satisfaction
• Satisfactory
• Scandinavian
• Scapegoating
• Scatological
• Scatterbrain
• Scheherazade
• Scholarships
• Schoolmaster
• Screenwriter
• Screwdrivers
• Scriptwriter
• Scrupulously
• Scrutinizing
• Sculpturally
• Seamstresses
• Searchlights
• Secessionist
• Secobarbital
• Sectarianism
• Segmentation
• Seismographs
• Seismologist
• Selflessness
• Semicircular
• Separateness
• Sequentially
• Sequestering
• Shapeshifter
• Sharecropper
• Shareholders
• Sharpshooter
• Shatterproof
• Shipbuilders
• Shipbuilding
• Shortchanged
• Shortcomings
• Shortsighted
• Shuffleboard
• Sidestepping
• Significance
• Similarities
• Simpleminded
• Simultaneous
• Skateboarder
• Skullduggery
• Skyrocketing
• Slaughtering
• Sledgehammer
• Sleepwalkers
• Sleepwalking
• Sluggishness
• Snaggletooth
• Snowmobiling
• Sociological
• Sociologists
• Solicitation
• Somnambulism
• Somnambulist
• Sophisticate
• Soundproofed
• Southeastern
• Southernmost
• Southwestern
• Speakerphone
• Spearheading
• Specialising
• Specialities
• Specializing
• Specifically
• Spectrograph
• Spectrometer
• Spectrometry
• Spectroscope
• Spectroscopy
• Speculations
• Speechifying
• Spellbinding
• Spidermonkey
• Spinsterhood
• Spiritualism
• Spiritualist
• Spirituality
• Spokesperson
• Sponsorships
• Sporadically
• Sportscaster
• Sportswriter
• Spreadsheets
• Stagecoaches
• Staggeringly
• Standardised
• Standardized
• Statistician
• Steeplechase
• Stenographer
• Stepbrothers
• Stepchildren
• Stepdaughter
• Stereophonic
• Stereoscopic
• Stereotyping
• Stethoscopes
• Stewardesses
• Stipulations
• Stockbrokers
• Stockholders
• Stomachaches
• Stonewalling
• Storekeepers
• Storytellers
• Storytelling
• Stradivarius
• Straightaway
• Straightened
• Straightener
• Straitjacket
• Stranglehold
• Strangulated
• Stratosphere
• Strawberries
• Streamlining
• Streetwalker
• Strengthened
• Streptomycin
• Structurally
• Stubbornness
• Stupendously
• Subarachnoid
• Subcommander
• Subcommittee
• Subconscious
• Subcontinent
• Subcutaneous
• Subdivisions
• Subjectively
• Subjectivity
• Subliminally
• Submersibles
• Subordinated
• Subordinates
• Subscription
• Subsequently
• Subservience
• Subsidiaries
• Substantiate
• Substituting
• Substitution
• Substructure
• Subterranean
• Suburbanites
• Successfully
• Successively
• Sufficiently
• Suffragettes
• Sugarcoating
• Suggestively
• Supercharged
• Supercharger
• Supercilious
• Superhighway
• Superimposed
• Superlatives
• Supermarkets
• Supernatural
• Superpowered
• Superstition
• Supplemental
• Supplemented
• Supplication
• Suppositions
• Suppressants
• Supraorbital
• Supremacists
• Surprisingly
• Surrealistic
• Surrendering
• Surroundings
• Surveillance
• Suspiciously
• Swashbuckler
• Switchblades
• Switchboards
• Symbolically
• Sympathizers
• Sympathizing
• Synchronised
• Synchronized
• Synchronizer
• Synthesizers
• Synthesizing

12 Letter Words Starting With T

• Tangentially
• Taramasalata
• Taxidermists
• Teaspoonfuls
• Technicality
• Technocratic
• Technologies
• Technologist
• Teenyboppers
• Telegraphing
• Telegraphist
• Teleprompter
• Telharmonium
• Temperaments
• Temperatures
• Tenochtitlan
• Terminations
• Terrestrials
• Terribleness
• Terrifically
• Terrifyingly
• Tessellation
• Testamentary
• Testimonials
• Testosterone
• Tetracycline
• Tetrodotoxin
• Tezcatlipoca
• Thankfulness
• Thanksgiving
• Theatergoers
• Theatrically
• Thematically
• Theophylline
• Theoretician
• Theosophical
• Therapeutics
• Therethrough
• Thermocouple
• Thermometers
• Thermosphere
• Thermostatic
• Thoracostomy
• Thoroughbred
• Thoroughfare
• Thoroughness
• Thoughtfully
• Thousandfold
• Thunderation
• Thunderbolts
• Thunderclaps
• Thundercloud
• Thunderheads
• Thunderously
• Thunderstick
• Thunderstorm
• Timelessness
• Titanosaurus
• Tobacconists
• Togetherness
• Toothbrushes
• Totalitarian
• Toxicologist
• Tracheostomy
• Tradespeople
• Trailblazers
• Trailblazing
• Trailbreaker
• Trajectories
• Trampolining
• Tranquilized
• Tranquilizer
• Tranquillise
• Tranquillity
• Transactions
• Transceivers
• Transcendent
• Transcending
• Transcribing
• Transduction
• Transferable
• Transference
• Transferring
• Transfigured
• Transfigures
• Transformers
• Transforming
• Transfusions
• Transgressed
• Transgresses
• Transgressor
• Transitional
• Transitioned
• Translations
• Translucency
• Transmission
• Transmitters
• Transmitting
• Transmogrify
• Transoceanic
• Transorbital
• Transpacific
• Transparency
• Transplanted
• Transponders
• Transporters
• Transporting
• Transsexuals
• Transversely
• Transvestism
• Transvestite
• Traumatizing
• Traumatology
• Tremendously
• Triangulated
• Triangulates
• Tribespeople
• Tribulations
• Triglyceride
• Trigonometry
• Triphosphate
• Triumphantly
• Trivialities
• Trivializing
• Troublemaker
• Troubleshoot
• Truthfulness
• Tuberculosis
• Turbocharger
• Tyrannosaurs

12 Letter Words Starting With U

• Unacceptable
• Unaccustomed
• Unachievable
• Unacquainted
• Unaffiliated
• Unaffordable
• Unanswerable
• Unapologetic
• Unappetizing
• Unassailable
• Unattainable
• Unattractive
• Unauthorised
• Unauthorized
• Unbelievable
• Unbelievably
• Unbreathable
• Unchallenged
• Unchangeable
• Unchaperoned
• Uncharitable
• Unclassified
• Uncontrolled
• Unconvincing
• Uncultivated
• Undefeatable
• Undemocratic
• Undependable
• Underclothes
• Undercoating
• Undercurrent
• Undercutting
• Underdressed
• Undergarment
• Underpinning
• Underpowered
• Underselling
• Undersheriff
• Understaffed
• Understudied
• Understudies
• Undertakings
• Underwriters
• Underwriting
• Underwritten
• Undetectable
• Undetermined
• Undiminished
• Undiscovered
• Undocumented
• Unemployable
• Unemployment
• Unencumbered
• Unexpectedly
• Unfathomable
• Unfavourable
• Unfertilized
• Unflattering
• Unforgivable
• Unforgivably
• Unfortunates
• Unfulfilling
• Ungovernable
• Unidentified
• Unilaterally
• Unimaginable
• Unimaginably
• Unimpressive
• Uninterested
• Universality
• Universities
• Unmanageable
• Unmeasurable
• Unmercifully
• Unmistakable
• Unmistakably
• Unnoticeable
• Unobstructed
• Unobtainable
• Unofficially
• Unparalleled
• Unpardonable
• Unpleasantly
• Unpopularity
• Unprejudiced
• Unprincipled
• Unproductive
• Unprofitable
• Unquenchable
• Unquestioned
• Unreasonable
• Unreasonably
• Unrecognized
• Unreconciled
• Unregistered
• Unremarkable
• Unrepeatable
• Unreservedly
• Unresponsive
• Unrestrained
• Unrestricted
• Unsanctified
• Unsanctioned
• Unsatisfying
• Unscientific
• Unscrupulous
• Unseasonable
• Unseasonably
• Unstructured
• Unsuccessful
• Unsupervised
• Unsurprising
• Unsuspecting
• Unthinkingly
• Untouchables
• Untranslated
• Unverifiable
• Unworthiness
• Uproariously
• Urbanization

12 Letter Words Starting With V

• Vacationists
• Vacationland
• Vaccinations
• Vacillations
• Vaginoplasty
• Vainglorious
• Valenciennes
• Valorization
• Vaporization
• Vascularized
• Vasectomised
• Vasectomized
• Vasodilation
• Vaudevillian
• Vegetational
• Venerability
• Vengefulness
• Venipuncture
• Venomization
• Ventromedial
• Verification
• Vermiculated
• Veterinarian
• Veterinaries
• Vibraphonist
• Vibromassage
• Vicissitudes
• Victoriously
• Vigorousness
• Vilification
• Villainesses
• Villainously
• Vinaigrettes
• Vindications
• Vindictively
• Vinification
• Violoncellos
• Virtuosities
• Virtuousness
• Visceromotor
• Visibilities
• Vitalization
• Vitaminizing
• Vitriolizing
• Vituperating
• Vituperation
• Vituperative
• Vocabularies
• Vocalisation
• Vocalization
• Vocationally
• Vociferating
• Vociferously
• Volatilities
• Volcanically
• Voluminously
• Volunteering
• Volunteerism
• Voluptuaries
• Voluptuously

12 Letter Words Starting With W

• Wainscotting
• Wallpapering
• Warehouseman
• Warehousemen
• Warmongering
• Washingtonia
• Wastebaskets
• Wastefulness
• Watchdogging
• Watchfulness
• Watercourses
• Waterlogging
• Watermanship
• Waterproofed
• Weatherboard
• Weathermaker
• Weatherproof
• Weathertight
• Weightlessly
• Weightlifter
• Weisenheimer
• Wellingtonia
• Welterweight
• Westernising
• Westernizing
• Westinghouse
• Wheelbarrows
• Wheelwrights
• Whencesoever
• Wherethrough
• Whimsicality
• Whippoorwill
• Whitewashing
• Wholehearted
• Wicketkeeper
• Wildernesses
• Williamsonia
• Winterbourne
• Wintergreens
• Wisecrackers
• Wisecracking
• Withholdings
• Withstanding
• Wonderstruck
• Wondrousness
• Woodcarvings
• Woodshedding
• Wordlessness
• Workingwomen
• Workstations
• Worshipfully
• Wretchedness
• Wristwatches
• Wrongfulness
• Wunderkinder

12 Letter Words Starting With X

Only 39 English words start with X at twelve letters, nearly all built on the Greek roots xantho- (yellow), xero- (dry) and xylo- (wood).

• Xanthochroid
• Xanthomatous
• Xanthopterin
• Xenoparasite
• Xerophthalmy
• Xeroprinting
• Xiphisternum
• Xylophonists

12 Letter Words Starting With Y

Y is the scarcest starting letter at this length. English has just 18, and only youthfulness and yellowhammer are in general use.

• Yellowhammer
• Yellowshanks
• Yellowthroat
• Yieldingness
• Yorkshireman
• Younghearted
• Youthfulness
• Yugoslavians

12 Letter Words Starting With Z

Z produces 63 words at twelve letters, most built on zoo- (animal) or zygo- (paired).

• Zincographer
• Zoochemistry
• Zoogeography
• Zoographical
• Zoologically
• Zoroastrians
• Zygomorphous
• Zymotechnics

Twelve Letter Words With Meanings for Everyday Writing

Eighty definitions, kept short. The first forty belong to ordinary speech and writing, the second forty to formal and professional use.

• Relationship: the connection between two people or groups.
• Conversation: a spoken exchange between people.
• Neighborhood: the area around your home and the people in it.
• Unbelievable: too extreme to believe.
• Disappointed: let down by an outcome.
• Embarrassing: causing self-conscious discomfort.
• Headquarters: the central office an organisation operates from.
• Instructions: steps that explain how to do something.
• Fingerprints: the ridge patterns on your fingertips.
• Thanksgiving: the autumn holiday in the United States and Canada.
• Announcement: a public statement that makes news official.
• Photographer: a person who takes photographs.
• Arrangements: plans made in advance, or how objects are positioned.
• Accidentally: without intending to.
• Presentation: a talk given to an audience.
• Accomplished: highly skilled through practice.
• Championship: the contest that decides a champion.
• Congratulate: to tell someone you are pleased about their success.
• Deliberately: on purpose.
• Occasionally: now and then rather than regularly.
• Expectations: what you believe will happen.
• Nevertheless: in spite of what came before.
• Overwhelming: too intense to handle.
• Refrigerator: the appliance that keeps food cold.
• Acquaintance: someone you know slightly.
• Successfully: achieving the intended result.
• Grandparents: the parents of your parents.
• Surprisingly: contrary to what you would predict.
• Handkerchief: a cloth square for wiping the face.
• Breakthrough: a sudden advance past an obstacle.
• Considerable: large enough to notice.
• Reservations: bookings in your name, or private doubts.
• Temperatures: measurements of heat and cold.
• Kindergarten: the first school year for young children.
• Preparations: work done in advance of an event.
• Appointments: arranged times to meet.
• Enthusiastic: eager and openly interested.
• Circumstance: a condition that shapes what happens.
• Surroundings: everything in the space around you.
• Troublemaker: a person who deliberately causes conflict.
• Professional: relating to paid expert work.
• Intelligence: the ability to reason, and gathered information about a threat.
• Commissioner: an official heading a commission or a league.
• Construction: the act of building.
• Surveillance: close watch kept on a person or place.
• Consequences: the results of an action.
• Organization: a structured body of people.
• Specifically: precisely, naming the exact case.
• Civilization: an advanced society with cities and government.
• Psychiatrist: a doctor who treats mental illness.
• Independence: freedom from another’s control.
• Transmission: the sending of a signal, or a vehicle gearbox.
• Prescription: a doctor’s written order for medicine.
• Confidential: private between named parties.
• Satisfaction: the sense that a standard has been met.
• Registration: entering a name on an official record.
• Constitution: the founding rules of a state.
• Confirmation: proof that something is settled.
• Intellectual: relating to reasoning and study.
• Presidential: relating to a president.
• Conservative: cautious about change, or a low estimate.
• Psychologist: a specialist in behaviour and the mind.
• Jurisdiction: the legal authority a court has.
• Compensation: payment for loss, injury or work.
• Distribution: how something is shared out.
• Architecture: the design of buildings or of a system.
• Contribution: something given to a shared effort.
• Unacceptable: below the standard that will be tolerated.
• Appreciation: grateful recognition, or a rise in value.
• Introduction: the opening part of a text.
• Negotiations: talks held to reach agreement.
• Intervention: stepping in to change an outcome.
• Significance: the importance a fact has.
• Unemployment: the state of having no paid work.
• Imprisonment: confinement in prison as punishment.
• Irresistible: too forceful to be refused.
• Requirements: conditions that must be met.
• Availability: whether something is free to be used.
• Manufacturer: the company that makes a product.
• Productivity: output achieved for the effort spent.

Twelve Letter Words With No Repeating Letters

English has 243 twelve letter words that use twelve different letters with nothing repeated. Against more than 20,000 words at this length, that is one in eighty. Most of the 243 are technical. These forty are the recognisable ones.

• Unforgivable
• Considerably
• Housewarming
• Malnourished
• Thunderclaps
• Demographics
• Ambidextrous
• Unprofitable
• Bankruptcies
• Demonstrably
• Productively
• Exclusionary
• Metalworking
• Nightwalkers
• Customizable
• Questionably
• Stenographic
• Recognizably
• Bluestocking
• Packinghouse
• Upholstering
• Cryptomnesia
• Multipronged
• Unimprovable
• Unmethodical
• Sulphonamide
• Locksmithery
• Lexicography
• Exhaustingly
• Configurable
• Unhysterical
• Unhospitable
• Expurgations
• Dismountable
• Flourishment
• Hypnotizable
• Stylographic
• Unformidable
• Hydrosulfite
• Remodulating

Ambidextrous is the one to remember: twelve letters, twelve different ones, and a word with everyday use.

12 Letter Words With Double Letters

A doubled letter at this length almost always marks a join, where a prefix meets a root or a root meets a suffix. Ir- plus resistible gives the double R in irresistible. Ac- plus cident gives the double C in accidentally.

Embarrassing has two doubles at once, an RR and an SS, which is why it is among the most misspelled words in English.

Highest Scoring Plays in Scrabble and Words With Friends

A twelve letter word needs seven tiles from your rack plus five already on the board, so it occurs rarely. A play this long covers several premium squares at once. Each value is the raw tile total before any double or triple square.

The theoretical maximum is higher. Quizzicality and quizzability both total 44 raw points, though neither occurs in real play. In Words With Friends, where tile values differ, razzmatazzes has the top twelve letter score at 51 points.

Shorter plays decide far more games. For the lengths that matter in practice, see the 5 letter words finder.

The Suffix Families Behind Most 12 Letter Words

Twelve letters is long enough that most words at this length were built rather than inherited. A six or seven letter root takes a suffix and the total comes to twelve. Four families produce most of them: 1,104 words end in -tion, 1,235 end in -ness, 2,029 end in -ing, and 2,140 end in -ly. Recognise the family and you can predict both the meaning and the spelling.

12 Letter Words Ending in TION

The -tion suffix turns a verb into the name of its process or result. Construct becomes construction, the act of building. Every word here follows that same rule.

• Conversation
• Construction
• Organization
• Civilization
• Presentation
• Prescription
• Satisfaction
• Registration
• Constitution
• Confirmation
• Jurisdiction
• Compensation
• Distribution
• Contribution
• Appreciation
• Introduction
• Intervention
• Resurrection
• Congregation
• Superstition
• Intersection
• Anticipation
• Manipulation
• Interruption
• Installation
• Consultation
• Exploitation
• Intoxication
• Conservation
• Acceleration
• Recollection
• Complication
• Preservation
• Reproduction
• Coordination
• Intimidation
• Inauguration
• Subscription
• Annihilation
• Exaggeration
• Proclamation
• Inflammation
• Cancellation
• Regeneration
• Notification
• Dissertation
• Continuation
• Modification
• Verification
• Commendation
• Purification
• Emancipation
• Infiltration
• Insurrection
• Solicitation
• Deliberation
• Illustration
• Malnutrition
• Illumination
• Accumulation

12 Letter Words Ending in NESS

The -ness suffix turns an adjective into the name of the quality itself. Stubborn becomes stubbornness, and the doubled N comes from the root already ending in one.

• Stubbornness
• Helplessness
• Carelessness
• Togetherness
• Restlessness
• Recklessness
• Hopelessness
• Faithfulness
• Homelessness
• Childishness
• Selflessness
• Ruthlessness
• Friendliness
• Preparedness
• Truthfulness
• Fearlessness
• Thoroughness
• Wretchedness
• Homesickness
• Graciousness
• Cheerfulness
• Youthfulness
• Peacefulness
• Gratefulness
• Completeness
• Decisiveness
• Indebtedness
• Handsomeness
• Thankfulness
• Unworthiness
• Timelessness
• Separateness
• Gorgeousness
• Preciousness
• Sluggishness
• Backwardness
• Pleasantness
• Impoliteness
• Covetousness
• Cohesiveness
• Creativeness
• Fruitfulness
• Spaciousness
• Gracefulness
• Cowardliness

For patterns built at the front of a word instead of the back, see the words that start with collection, and for endings at other lengths, the words that end with collection.

Positive Twelve Letter Words Worth Learning

These forty express warmth or approval, which makes them suited to a reference, a card or a note of praise.

• Accomplished: skilled through real practice.
• Appreciation: grateful recognition of what someone gave.
• Enlightening: giving understanding you did not have before.
• Harmoniously: in agreement, with no friction between the parts.
• Encouraging: giving someone the confidence to continue.
• Considerate: attentive to how your actions affect others.
• Trustworthy: reliable enough to be given responsibility.
• Resourceful: quick at finding a way through with what is available.
• Enthusiastic: eager and openly interested.
• Refreshingly: in a way that is a welcome change from the usual.
• Thankfulness: the settled state of being grateful.
• Graciousness: courtesy shown warmly rather than dutifully.
• Cheerfulness: a steady good humour others notice.
• Peacefulness: calm that holds under pressure.
• Gratefulness: ongoing awareness of what you were given.
• Friendliness: natural warmth towards people you have just met.
• Selflessness: placing another person’s need ahead of your own.
• Faithfulness: staying loyal to a person, promise or standard.
• Truthfulness: consistent honesty, including when it costs you.
• Creativeness: the habit of finding original solutions.
• Gracefulness: ease and control in movement or in handling a situation.
• Fruitfulness: producing results worth having.
• Preciousness: the quality of being genuinely valued.
• Gorgeousness: striking beauty, said warmly rather than formally.
• Decisiveness: settling a matter quickly and standing behind it.
• Completeness: nothing missing and nothing half done.
• Thoroughness: care taken to leave nothing out.
• Togetherness: the closeness within a family or team.
• Youthfulness: energy and openness at any age.
• Cohesiveness: the quality that keeps a group together.
• Spaciousness: roominess that makes a place feel calm.
• Pleasantness: mild, easy agreeableness in a person or a day.
• Breakthrough: the advance that finally clears an obstacle.
• Congratulate: to tell someone you are glad about their success.
• Considerably: by an amount large enough to matter.
• Productively: in a way that yields real output.
• Recognizably: clearly enough to be identified at once.
• Demonstrably: provably, in a way that can be shown.
• Instrumental: playing the decisive part in a good outcome.
• Compassionate: feeling for another person’s difficulty and acting on it.

How to Spell and Remember Long Words

A twelve letter word is rarely one unit. It is a root with a prefix in front, a suffix behind, or both. Split the word at the joins and the spelling stops being a memory test.

Take transmission. The root is miss, from Latin mittere, to send. Trans- means across. -ion names the process. Sending across, as a process. Once the parts are visible, the double S is explained: one S ends the root and one begins the suffix.

The same split works on circumstance (circum- around, stare to stand), jurisdiction (juris of law, dictio speaking) and independence (in- not, depend, -ence the state of). Three roots learned, dozens of words explained.

For longer words, see the long words collection.

The Twelve Letter Words People Spell Wrong Most

Three errors account for nearly every mistake at this length: a doubled consonant reduced to one, -ance written where -ence belongs, and -tion written where -sion belongs.

Embarassing ❌ Embarrassing ✅

Occassionally ❌ Occasionally ✅

Independance ❌ Independence ✅

Transmition ❌ Transmission ✅

Succesfully ❌ Successfully ✅

Surveillence ❌ Surveillance ✅

Refridgerator ❌ Refrigerator ✅

Dissapointed ❌ Disappointed ✅

Accidentaly ❌ Accidentally ✅

Apreciation ❌ Appreciation ✅

The rule behind all ten: when a prefix ends in the same letter the root begins with, both letters stay. Dis- plus appointed keeps both the S and the A, and doubles the P that is already in appoint.

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