achromatic vs pearly

achromatic is not a noun while pearly is a noun.

Word	Noun	Adjective	Verb	Adverb
achromatic	No	Yes	No	No
pearly	Yes	Yes	No	No

achromatic (noun)	pearly (noun)
	informal terms for a human `tooth'

achromatic (adjective)	pearly (adjective)
having no hue	of a white the color of pearls