drop vs decline

drop and decline both are nouns.

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

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

Other hypernyms of drop include worsen.

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

Other hypernyms of drop include go down, wane.

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

Other hyponyms of drop include dump, plunge, plummet, plump, flump, flump down.

drop (noun)	decline (noun)
the act of dropping something	a downward slope or bend
a central depository where things can be left or picked up	a gradual decrease; as of stored charge or current
a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery	change toward something smaller or lower
a sudden sharp decrease in some quantity	a condition inferior to an earlier condition; a gradual falling off from a better state; decline
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

drop (verb)	decline (verb)
give birth; used for animals	grow smaller
grow progressively worse	grow worse
go down in value	show unwillingness towards
stop pursuing or acting	inflect for number, gender, case, etc.
change from one level to another	go down
lower the pitch of (musical notes)	fall in value
fall or sink into a state of exhaustion or death	not accept as true
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