aquamarine vs aqua

aquamarine and aqua both are nouns.

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

As nouns, aquamarine and aqua are synonyms defined as:

Other synonyms of aquamarine include cobalt blue, greenish blue, peacock blue, turquoise.

aquamarine (noun)	aqua (noun)
a shade of blue tinged with green	a shade of blue tinged with green
a transparent variety of beryl that is blue green in color