plunge vs dart

plunge and dart both are nouns.

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

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

Other hypernyms of plunge include dash, flash, scoot, scud, shoot.

plunge (noun)	dart (noun)
a brief swim in water	a sudden quick movement
a steep and rapid fall	a tapered tuck made in dressmaking
	a small narrow pointed missile that is thrown or shot

plunge (verb)	dart (verb)
begin with vigor	run or move very quickly or hastily
devote (oneself) fully to	move along rapidly and lightly; skim or dart
cause to be immersed	move with sudden speed
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