belieber vs buff

belieber and buff both are nouns.

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

As nouns, buff is a hypernym of belieber; that is, buff is a word with a broader meaning than belieber:

Other hypernyms of belieber include devotee, fan, lover.

belieber (noun)	buff (noun)
A fan of Justin Bieber	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

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

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