buoy vs can buoy

buoy and can buoy both are nouns.

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

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

buoy: a float attached by rope to the seabed to mark channels in a harbor or underwater hazards; typically brightly-coloured
can buoy: a buoy with a round bottom and conical top

Other hyponyms of buoy include acoustic buoy, can, conical buoy, nun, nun buoy, spar buoy.

buoy (noun)	can buoy (noun)
a float attached by rope to the seabed to mark channels in a harbor or underwater hazards; typically brightly-coloured	a buoy with a round bottom and conical top