fisherman vs skilled worker

fisherman and skilled worker both are nouns.

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

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

Other hypernyms of fisherman include skilled workman, trained worker.

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