pressman vs trained worker

pressman and trained worker both are nouns.

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

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

Other hypernyms of pressman include skilled worker, skilled workman.

pressman (noun)	trained worker (noun)
someone whose occupation is printing	a worker who has acquired special skills
a male journalist employed to provide news stories for newspapers or broadcast media