chromatic vs cerulean

chromatic is not a noun while cerulean is a noun.

Word	Noun	Adjective	Verb	Adverb
chromatic	No	Yes	No	No
cerulean	Yes	Yes	No	No

chromatic (noun)	cerulean (noun)
	a light shade of blue

chromatic (adjective)	cerulean (adjective)
being or having or characterized by hue	of a deep somewhat purplish blue color similar to that of a clear October sky
based on a scale consisting of 12 semitones
able to refract light without spectral color separation