raw sienna vs buff

raw sienna and buff both are nouns.

Word	Noun	Adjective	Verb	Adverb
raw sienna	Yes	No	No	No
buff	Yes	Yes	Yes	No

As nouns, raw sienna and buff are synonyms defined as:

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

raw sienna (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 yellowish-brown pigment made from untreated sienna	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

raw sienna (adjective)	buff (adjective)
	of the yellowish-beige color of buff leather

raw sienna (verb)	buff (verb)
	polish and make shiny
	strike, beat repeatedly