engraver vs lapidist

engraver and lapidist both are nouns.

Word	Noun	Adjective	Verb	Adverb
engraver	Yes	No	No	No
lapidist	Yes	No	No	No

As nouns, lapidist is a hyponym of engraver; that is, lapidist is a word with a more specific, narrower meaning than engraver:

engraver: a skilled worker who can inscribe designs or writing onto a surface by carving or etching
lapidist: a skilled worker who cuts and engraves precious stones

Other hyponyms of engraver include lapidary.

engraver (noun)	lapidist (noun)
a printmaker who prints from an engraved printing plate	a skilled worker who cuts and engraves precious stones
a skilled worker who can inscribe designs or writing onto a surface by carving or etching