chromatic vs drab

chromatic is not a noun while drab is a noun.

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

chromatic (noun)	drab (noun)
	a dull greyish to yellowish or light olive brown

chromatic (adjective)	drab (adjective)
being or having or characterized by hue	of a light brownish green color
based on a scale consisting of 12 semitones	lacking brightness or color; dull
able to refract light without spectral color separation	causing dejection
	lacking in liveliness or charm or surprise