natation vs prone float

natation and prone float both are nouns.

Word	Noun	Adjective	Verb	Adverb
natation	Yes	No	No	No
prone float	Yes	No	No	No

As nouns, prone float is a hyponym of natation; that is, prone float is a word with a more specific, narrower meaning than natation:

natation: the act of someone who floats on the water
prone float: a floating position with the face down and arms stretched forward

Other hyponyms of natation include dead-man's float.

natation (noun)	prone float (noun)
the act of someone who floats on the water	a floating position with the face down and arms stretched forward