drab vs chromatic

drab is a noun but chromatic is not a noun.

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

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

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