fisherman vs trained worker

fisherman and trained worker both are nouns.

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

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

Other hypernyms of fisherman include skilled worker, skilled workman.

fisherman (noun)	trained worker (noun)
someone whose occupation is catching fish	a worker who has acquired special skills