aqua vs aquamarine

aqua and aquamarine both are nouns.

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

As nouns, aqua and aquamarine are synonyms defined as:

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

aqua (noun)	aquamarine (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