yellowish brown vs buff

yellowish brown and buff both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellowish brown	Yes	No	No	No
buff	Yes	Yes	Yes	No

As nouns, yellowish brown and buff are synonyms defined as:

Other synonyms of yellowish brown include caramel, caramel brown, raw sienna.

yellowish brown (noun)	buff (noun)
a medium to dark tan color	an implement consisting of soft material mounted on a block; used for polishing (as in manicuring)
	a medium to dark tan color
	bare skin
	an ardent follower and admirer
	a soft thick undyed leather from the skins of e.g. buffalo or oxen

yellowish brown (adjective)	buff (adjective)
	of the yellowish-beige color of buff leather

yellowish brown (verb)	buff (verb)
	polish and make shiny
	strike, beat repeatedly