plunk vs nosedive

plunk and nosedive both are nouns.

Word	Noun	Adjective	Verb	Adverb
plunk	Yes	No	Yes	Yes
nosedive	Yes	No	Yes	No

As verbs, nosedive is a hyponym of plunk; that is, nosedive is a word with a more specific, narrower meaning than plunk:

Other hyponyms of plunk include power-dive, duck, crash-dive, chute, jump, parachute.

plunk (noun)	nosedive (noun)
(baseball) hitting a baseball so that it drops suddenly	a steep nose-down descent by an aircraft
a hollow twanging sound	a sudden sharp drop or rapid decline

plunk (verb)	nosedive (verb)
pull lightly but sharply with a plucking motion	plunge nose first; drop with the nose or front first, of aircraft
set (something or oneself) down with or as if with a noise
drop steeply
make or move along with a sound as of a horse's hooves striking the ground

plunk (adverb)	nosedive (adverb)
with a short hollow thud