plunge vs drop

plunge and drop both are nouns.

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

As nouns, drop is a hypernym of plunge; that is, drop is a word with a broader meaning than plunge:

Other hypernyms of plunge include fall.

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

plunge (noun)	drop (noun)
a brief swim in water	the act of dropping something
a steep and rapid fall	a central depository where things can be left or picked up
	a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery
	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

plunge (verb)	drop (verb)
begin with vigor	give birth; used for animals
devote (oneself) fully to	grow progressively worse
cause to be immersed	go down in value
immerse briefly into a liquid so as to wet, coat, or saturate	stop pursuing or acting
thrust or throw into	change from one level to another
fall abruptly	lower the pitch of (musical notes)
drop steeply	fall or sink into a state of exhaustion or death
dash violently or with great speed or impetuosity	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