chromatic vs powder blue

chromatic is not a noun while powder blue is a noun.

Word	Noun	Adjective	Verb	Adverb
chromatic	No	Yes	No	No
powder blue	Yes	Yes	No	No

chromatic (noun)	powder blue (noun)
	a pale blue color with grey in it

chromatic (adjective)	powder blue (adjective)
being or having or characterized by hue	of a moderate to pale blue or purplish blue
based on a scale consisting of 12 semitones
able to refract light without spectral color separation