swim vs buoy

swim and buoy both are nouns.

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

As verbs, buoy is a hyponym of swim; that is, buoy is a word with a more specific, narrower meaning than swim:

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

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

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