engraver vs trained worker

engraver and trained worker both are nouns.

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

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

engraver: a skilled worker who can inscribe designs or writing onto a surface by carving or etching
trained worker: a worker who has acquired special skills

Other hypernyms of engraver include skilled worker, skilled workman.

engraver (noun)	trained worker (noun)
a printmaker who prints from an engraved printing plate	a worker who has acquired special skills
a skilled worker who can inscribe designs or writing onto a surface by carving or etching