aventurine vs transparent gem

aventurine and transparent gem both are nouns.

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

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

aventurine: a translucent quartz spangled with bits of mica or other minerals
transparent gem: a gemstone having the property of transmitting light without serious diffusion

Other hypernyms of aventurine include quartz.

aventurine (noun)	transparent gem (noun)
a translucent quartz spangled with bits of mica or other minerals	a gemstone having the property of transmitting light without serious diffusion