dive vs plunge

dive and plunge both are nouns.

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

As verbs, dive and plunge are synonyms defined as:

Other synonyms of dive include plunk.

dive (noun)	plunge (noun)
a steep nose-down descent by an aircraft	a brief swim in water
a headlong plunge into water	a steep and rapid fall
a cheap disreputable nightclub or dance hall

dive (verb)	plunge (verb)
drop steeply	begin with vigor
swim under water	devote (oneself) fully to
plunge into water	cause to be immersed
	immerse briefly into a liquid so as to wet, coat, or saturate
	thrust or throw into
	fall abruptly
	drop steeply
	dash violently or with great speed or impetuosity