dive vs swan dive

dive and swan dive both are nouns.

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

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

dive: a headlong plunge into water
swan dive: a dive in which the diver arches the back with arms outstretched before entering the water

dive (noun)	swan dive (noun)
a steep nose-down descent by an aircraft	a dive in which the diver arches the back with arms outstretched before entering the water
a headlong plunge into water
a cheap disreputable nightclub or dance hall