cobalt blue vs turquoise

cobalt blue and turquoise both are nouns.

Word	Noun	Adjective	Verb	Adverb
cobalt blue	Yes	No	No	No
turquoise	Yes	No	No	No

As nouns, cobalt blue and turquoise are synonyms defined as:

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

cobalt blue (noun)	turquoise (noun)
a shade of blue tinged with green	a shade of blue tinged with green
greenish-blue pigment consisting essentially of cobalt oxide and alumina	a blue to grey green mineral consisting of copper aluminum phosphate