garnet vs transparent gem

garnet and transparent gem both are nouns.

Word	Noun	Adjective	Verb	Adverb
garnet	Yes	No	No	No
transparent gem	Yes	No	No	No

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

garnet: any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive
transparent gem: a gemstone having the property of transmitting light without serious diffusion

Other hypernyms of garnet include mineral.

garnet (noun)	transparent gem (noun)
any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive	a gemstone having the property of transmitting light without serious diffusion