brownness vs brown

brownness and brown both are nouns.

Word	Noun	Adjective	Verb	Adverb
brownness	Yes	No	No	No
brown	Yes	Yes	Yes	No

As nouns, brownness and brown are synonyms defined as:

brownness (noun)	brown (noun)
an orange of low brightness and saturation	an orange of low brightness and saturation

brownness (adjective)	brown (adjective)
	(of skin) deeply suntanned
	of a color similar to that of wood or earth

brownness (verb)	brown (verb)
	fry in a pan until it changes color
	make brown in color