breeches buoy vs life belt

breeches buoy and life belt both are nouns.

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

As nouns, life belt is a hypernym of breeches buoy; that is, life belt is a word with a broader meaning than breeches buoy:

breeches buoy: a life buoy in the form of a ring with short breeches for support; used to transfer people from a ship
life belt: a life preserver in the form of a ring of buoyant material

Other hypernyms of breeches buoy include life buoy, life ring, lifesaver.

breeches buoy (noun)	life belt (noun)
a life buoy in the form of a ring with short breeches for support; used to transfer people from a ship	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