Economic refers to the science of economic.
economical means thrifty and less expensive.
He failed in economics and geography.
His way of living is most economical.
Effectual means that which produces a good effect.
Effective is that which produces an effect.
The new constitution has proved very effectual.
Paludrine is very effective for malaria.
Elapse is a verb meaning to pass and is used with reference to time only.
lapse means a period of time.
Many years elapsed after the event and nothing serious happened.
After the lapse of specified period, you can withdraw the amount from the fixed deposit account.
Elder is used with reference to a relative only.
Older is comparative degree of old.
His elder brother came to fetch him today.
Though still in his thirties, he looks older.
An ellipse is a geometrical figure somewhat similar to a circle.
ellipsis is a grammatical term meaning omission of words needed to complete sense.
It is difficult to draw an ellipse without a stencil or a piece of thread.
His whole conversation is full of ellipsis.
Evidence is the statement of fact.
testimony is the confirmation of a statement.
The evidence given by him was recorded by the police.
I bear testimony to the fact that he was an employee of the firm in the year 1928.
Excuse me, Pardon me
Excuse me is employed when the fault committed is minor.
pardon mean is used when the fault is serious and objectionable.
Excuse me I never requested you to show favour to me in any matter.
Pardon me, sir, I had no intention to injure your feelings.
Eruption is bursting out
irruption is sudden invasion.
Some years back there was an earthquake in Japan attended with volcanic eruption.
The irruption of the Huns destroyed fabric of the roman Empire.
Farther is used with reference to distance or space
further implies something additional in thought.
The nearer the church, the farther from God.
I know nothing further than that.
The word future should be used to denote time only.
Subsequent means following, later.
In future you should be careful about your work.
Subsequent events proved that he made a wrong start.
Gratified, Grateful .
Gratified means pleased
grateful means thankful.
He was gratified to recover his lost dog.
I am grateful to you for your many acts of kindness to me.
Graceful means handsome or agreeable
gracious means merciful.
He has a graceful appearance.
God save our gracious king.
Greed means instigate longing for something,
avarice means greed of gain or wealth.
He is so greedy what he would never be satisfied with what he gets.
Avarice has so seized upon mankind that their wealth seems rather to possess them, then they to possess their wealth.
Grandiloquent is one whose style is pompous or verbose.
eloquent is one who is a fluent and powerful speaker.
Our professor is rightly regarded as a grandiloquent speaker since his speech is usually full of sound and fury signifying nothing.
Mr. Jinnah was an eloquent speaker. .
Handicap is an artificial
hindrance resulting in advantage or disadvantages.
He succeeded in spite of many handicaps.
He proved a hindrance in my way.
Haply means by chance
happily means in a happy manner.
Happy I may remember and haply forget.
They lived happily over afterwards.
Henceforth means ever after his time implying continuity
hereafter means in future and also means in the next world.
Henceforth he will act as our leader and spokesman.
Hereafter we shall not quarrel with each other.