buoy vs swim

buoy and swim both are nouns.

Word	Noun	Adjective	Verb	Adverb
buoy	Yes	No	Yes	No
swim	Yes	No	Yes	No

As verbs, swim is a hypernym of buoy; that is, swim is a word with a broader meaning than buoy:

buoy: float on the surface of water
swim: be afloat either on or below a liquid surface and not sink to the bottom

Other hypernyms of buoy include float.

buoy (noun)	swim (noun)
a float attached by rope to the seabed to mark channels in a harbor or underwater hazards; typically brightly-coloured	the act of swimming

buoy (verb)	swim (verb)
mark with a buoy	travel through water
keep afloat	be afloat either on or below a liquid surface and not sink to the bottom
float on the surface of water	move as if gliding through water
	be covered with or submerged in a liquid
	be dizzy or giddy