jasper vs opaque gem

jasper and opaque gem both are nouns.

Word	Noun	Adjective	Verb	Adverb
jasper	Yes	No	No	No
opaque gem	Yes	No	No	No

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

jasper: an opaque form of quartz; red or yellow or brown or dark green in color; used for ornamentation or as a gemstone
opaque gem: a gemstone that is opaque

jasper (noun)	opaque gem (noun)
an opaque form of quartz; red or yellow or brown or dark green in color; used for ornamentation or as a gemstone	a gemstone that is opaque