reddish brown vs brown

reddish brown and brown both are nouns.

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

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

Other hypernyms of reddish brown include brownness.

reddish brown (noun)	brown (noun)
a shade of brown with a tinge of red	an orange of low brightness and saturation

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

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