fixer vs trained worker

fixer and trained worker both are nouns.

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

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

Other hypernyms of fixer include skilled worker, skilled workman.

fixer (noun)	trained worker (noun)
synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction	a worker who has acquired special skills
someone who intervenes with authorities for a person in trouble (usually using underhand or illegal methods for a fee)
a skilled worker who mends or repairs things
a chemical compound that sets or fixes something (as a dye or a photographic image)