plunge vs launch

plunge and launch both are nouns.

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

As verbs, plunge and launch are synonyms defined as:

plunge (noun)	launch (noun)
a brief swim in water	the act of propelling with force
a steep and rapid fall	a motorboat with an open deck or a half deck

plunge (verb)	launch (verb)
begin with vigor	begin with vigor
devote (oneself) fully to	propel with force
cause to be immersed	launch for the first time; launch on a maiden voyage
immerse briefly into a liquid so as to wet, coat, or saturate	get going; give impetus to
thrust or throw into	smoothen the surface of
fall abruptly	set up or found
drop steeply
dash violently or with great speed or impetuosity