nose dive vs descent

nose dive and descent both are nouns.

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

As nouns, descent is a hypernym of nose dive; that is, descent is a word with a broader meaning than nose dive:

nose dive (noun)	descent (noun)
a steep nose-down descent by an aircraft	the act of changing your location in a downward direction
	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