decline vs drop

decline and drop both are nouns.

Word	Noun	Adjective	Verb	Adverb
decline	Yes	No	Yes	No
drop	Yes	No	Yes	No

As verbs, drop is a hyponym of decline; that is, drop is a word with a more specific, narrower meaning than decline:

Other hyponyms of decline include dip, wear on.

As verbs, drop is a hyponym of decline; that is, drop is a word with a more specific, narrower meaning than decline:

As verbs, drop is a hypernym of decline; that is, drop is a word with a broader meaning than decline:

decline (noun)	drop (noun)
a downward slope or bend	the act of dropping something
a gradual decrease; as of stored charge or current	a central depository where things can be left or picked up
change toward something smaller or lower	a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery
a condition inferior to an earlier condition; a gradual falling off from a better state; decline	a sudden sharp decrease in some quantity
	a free and rapid descent by the force of gravity
	a predetermined hiding place for the deposit and distribution of illicit goods (such as drugs or stolen property)
	a steep high face of rock
	a small indefinite quantity (especially of a liquid)
	a shape that is spherical and small

decline (verb)	drop (verb)
grow smaller	give birth; used for animals
grow worse	grow progressively worse
show unwillingness towards	go down in value
inflect for number, gender, case, etc.	stop pursuing or acting
go down	change from one level to another
fall in value	lower the pitch of (musical notes)
not accept as true	fall or sink into a state of exhaustion or death
	leave undone or leave out
	omit (a letter or syllable) in speaking or writing
	utter with seeming casualness
	lose (a game)
	take (a drug, especially LSD), by mouth
	remove (cargo, people, etc.) from and leave
	to remove
	cause to fall by or as if by delivering a blow
	let or cause to fall in drops
	to fall vertically
	let fall to the ground
	fall or descend to a lower place or level
	pay out
	stop associating with
	terminate an association with
	hang loosely