lobsterman vs skilled worker

lobsterman and skilled worker both are nouns.

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

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

Other hypernyms of lobsterman include skilled workman, trained worker.

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