diminution vs nosedive

diminution and nosedive both are nouns.

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

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

diminution (noun)	nosedive (noun)
the act of decreasing or reducing something	a steep nose-down descent by an aircraft
the statement of a theme in notes of lesser duration (usually half the length of the original)	a sudden sharp drop or rapid decline
change toward something smaller or lower

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