drop vs sink

drop and sink both are nouns.

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

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

Other hyponyms of drop include fall off, slump, tumble.

As verbs, drop and sink are synonyms defined as:

Other synonyms of drop include drop down.

drop (noun)	sink (noun)
the act of dropping something	plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe
a central depository where things can be left or picked up	a covered cistern; waste water and sewage flow into it
a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery	a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
a sudden sharp decrease in some quantity	(technology) a process that acts to absorb or remove energy or a substance from a system
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)	sink (verb)
give birth; used for animals	fall heavily or suddenly; decline markedly
grow progressively worse	embed deeply
go down in value	go under
stop pursuing or acting	fall or descend to a lower place or level
change from one level to another	cause to sink
lower the pitch of (musical notes)	fall or sink heavily
fall or sink into a state of exhaustion or death	appear to move downward
leave undone or leave out	descend into or as if into some soft substance or place
omit (a letter or syllable) in speaking or writing	pass into a specified state or condition; sink into
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