preserver vs worker

preserver and worker both are nouns.

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

As nouns, worker is a hypernym of preserver; that is, worker is a word with a broader meaning than preserver:

Other hypernyms of preserver include actor, doer.

preserver (noun)	worker (noun)
rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning	sterile member of a colony of social insects that forages for food and cares for the larvae
a skilled worker who is employed to restore or refinish buildings or antique furniture	a person who works at a specific occupation
someone who keeps safe from harm or danger	a member of the working class (not necessarily employed)
a cook who preserves fruits or meat	a person who acts and gets things done