beryl vs aquamarine

beryl and aquamarine both are nouns.

Word	Noun	Adjective	Verb	Adverb
beryl	Yes	No	No	No
aquamarine	Yes	No	No	No

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

beryl: the chief source of beryllium; colored transparent varieties are valued as gems
aquamarine: a transparent variety of beryl that is blue green in color

Other hyponyms of beryl include emerald, morganite.

beryl (noun)	aquamarine (noun)
the chief source of beryllium; colored transparent varieties are valued as gems	a shade of blue tinged with green
	a transparent variety of beryl that is blue green in color