descent vs nosedive

descent and nosedive both are nouns.

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

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

Other hyponyms of descent include jump, parachuting, dive, nose dive, abseil, rappel, swoop, crash dive, drop, collapse, flop.

descent (noun)	nosedive (noun)
the act of changing your location in a downward direction	a steep nose-down descent by an aircraft
properties attributable to your ancestry	a sudden sharp drop or rapid decline
a movement downward
the hereditary derivation of an individual
a downward slope or bend
the kinship relation between an individual and the individual's progenitors

descent (verb)	nosedive (verb)
	plunge nose first; drop with the nose or front first, of aircraft