gem cutter vs cutter

gem cutter and cutter both are nouns.

Word	Noun	Adjective	Verb	Adverb
gem cutter	Yes	No	No	No
cutter	Yes	No	No	No

As nouns, cutter is a hypernym of gem cutter; that is, cutter is a word with a broader meaning than gem cutter:

gem cutter (noun)	cutter (noun)
one who cuts and shapes precious stones	a cutting implement; a tool for cutting
	a boat for communication between ship and shore
	a sailing vessel with a single mast set further back than the mast of a sloop
	someone whose work is cutting (as e.g. cutting cloth for garments)
	someone who carves the meat
	someone who cuts or carves stone