buff vs furbish

buff is a noun but furbish is not a noun.

Word	Noun	Adjective	Verb	Adverb
buff	Yes	Yes	Yes	No
furbish	No	No	Yes	No

As verbs, buff and furbish are synonyms defined as:

Other synonyms of buff include burnish.

buff (noun)	furbish (noun)
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

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

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