swimming vs floating

swimming and floating both are nouns.

Word	Noun	Adjective	Verb	Adverb
swimming	Yes	Yes	No	No
floating	Yes	Yes	No	No

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

Other hyponyms of swimming include bathe, skinny-dip, dip, plunge, dive, diving, natation, skin-dive, skin diving.

swimming (noun)	floating (noun)
the act of swimming	the act of someone who floats on the water

swimming (adjective)	floating (adjective)
applied to a fish depicted horizontally	borne up by or suspended in a liquid
filled or brimming with tears	inclined to move or be moved about
	not definitely committed to a party or policy
	(of a part of the body) not firmly connected; movable or out of normal position
	continually changing especially as from one abode or occupation to another