deep brown vs brown

deep brown and brown both are nouns.

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

As nouns, brown is a hypernym of deep brown; that is, brown is a word with a broader meaning than deep brown:

Other hypernyms of deep brown include brownness.

deep brown (noun)	brown (noun)
a medium brown to dark-brown color	an orange of low brightness and saturation

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

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