life belt vs life buoy

life belt and life buoy both are nouns.

Word	Noun	Adjective	Verb	Adverb
life belt	Yes	No	No	No
life buoy	Yes	No	No	No

As nouns, life belt and life buoy are synonyms defined as:

life belt and life buoy: a life preserver in the form of a ring of buoyant material

Other synonyms of life belt include life ring, lifesaver.

life belt (noun)	life buoy (noun)
a life preserver in the form of a ring of buoyant material	a life preserver in the form of a ring of buoyant material
belt attaching you to some object as a restraint in order to prevent you from getting hurt