plunge vs swim

plunge and swim both are nouns.

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

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

Other hypernyms of plunge include swimming.

plunge (noun)	swim (noun)
a brief swim in water	the act of swimming
a steep and rapid fall

plunge (verb)	swim (verb)
begin with vigor	travel through water
devote (oneself) fully to	be afloat either on or below a liquid surface and not sink to the bottom
cause to be immersed	move as if gliding through water
immerse briefly into a liquid so as to wet, coat, or saturate	be covered with or submerged in a liquid
thrust or throw into	be dizzy or giddy
fall abruptly
drop steeply
dash violently or with great speed or impetuosity