preserver vs life preserver

preserver and life preserver both are nouns.

Word	Noun	Adjective	Verb	Adverb
preserver	Yes	No	No	No
life preserver	Yes	No	No	No

As nouns, preserver and life preserver are synonyms defined as:

preserver and life preserver: rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning

Other synonyms of preserver include flotation device.

preserver (noun)	life preserver (noun)
rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning	rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning
a skilled worker who is employed to restore or refinish buildings or antique furniture
someone who keeps safe from harm or danger
a cook who preserves fruits or meat