peacock blue vs aqua

peacock blue and aqua both are nouns.

Word	Noun	Adjective	Verb	Adverb
peacock blue	Yes	No	No	No
aqua	Yes	No	No	No

As nouns, peacock blue and aqua are synonyms defined as:

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

peacock blue (noun)	aqua (noun)
a shade of blue tinged with green	a shade of blue tinged with green