full gainer vs dive

full gainer and dive both are nouns.

Word	Noun	Adjective	Verb	Adverb
full gainer	Yes	No	No	No
dive	Yes	No	Yes	No

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

full gainer: a dive in which the diver throws the feet forward to complete a full backward somersault and enters the water feet first and facing away from the diving board
dive: a headlong plunge into water

Other hypernyms of full gainer include diving.

full gainer (noun)	dive (noun)
a dive in which the diver throws the feet forward to complete a full backward somersault and enters the water feet first and facing away from the diving board	a steep nose-down descent by an aircraft
	a headlong plunge into water
	a cheap disreputable nightclub or dance hall