power dive vs dive

power dive and dive both are nouns.

Word	Noun	Adjective	Verb	Adverb
power dive	Yes	No	No	No
dive	Yes	No	Yes	No

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

power dive: a dive of an airplane that is accelerated both by gravity and by the power of the engine
dive: a steep nose-down descent by an aircraft

Other hypernyms of power dive include nose dive, nosedive.

power dive (noun)	dive (noun)
a dive of an airplane that is accelerated both by gravity and by the power of the engine	a steep nose-down descent by an aircraft
	a headlong plunge into water
	a cheap disreputable nightclub or dance hall