prone float vs dead-man's float

prone float and dead-man's float both are nouns.

Word	Noun	Adjective	Verb	Adverb
prone float	Yes	No	No	No
dead-man's float	Yes	No	No	No

As nouns, prone float and dead-man's float are synonyms defined as:

prone float and dead-man's float: a floating position with the face down and arms stretched forward

prone float (noun)	dead-man's float (noun)
a floating position with the face down and arms stretched forward	a floating position with the face down and arms stretched forward