lifesaver vs life belt

lifesaver and life belt both are nouns.

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

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

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

Other synonyms of lifesaver include life buoy, life ring.

lifesaver (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
an attendant employed at a beach or pool to protect swimmers from accidents	belt attaching you to some object as a restraint in order to prevent you from getting hurt