life buoy

English Thesaurus

1. a life preserver in the form of a ring of buoyant material (noun.artifact)

hypernym	:	flotation device, life preserver, preserver,
definition	:	rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning (noun.artifact)

hyponym	:	breeches buoy,
definition	:	a life buoy in the form of a ring with short breeches for support; used to transfer people from a ship (noun.artifact)