descent vs nose dive

descent and nose dive both are nouns.

Word	Noun	Adjective	Verb	Adverb
descent	Yes	No	No	No
nose dive	Yes	No	No	No

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

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

descent (noun)	nose dive (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 movement downward
the hereditary derivation of an individual
a downward slope or bend
the kinship relation between an individual and the individual's progenitors