lobsterman vs trained worker

lobsterman and trained worker both are nouns.

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

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

Other hypernyms of lobsterman include skilled worker, skilled workman.

lobsterman (noun)	trained worker (noun)
a person whose occupation is catching lobsters	a worker who has acquired special skills