life ring vs life belt

life ring and life belt both are nouns.

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

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

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

Other synonyms of life ring include life buoy, lifesaver.

life ring (noun)	life belt (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