preserver vs trained worker

preserver and trained worker both are nouns.

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

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

preserver: a skilled worker who is employed to restore or refinish buildings or antique furniture
trained worker: a worker who has acquired special skills

Other hypernyms of preserver include skilled worker, skilled workman.

preserver (noun)	trained worker (noun)
rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning	a worker who has acquired special skills
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