folk vs tribe

folk and tribe both are nouns.

Word	Noun	Adjective	Verb	Adverb
folk	Yes	No	No	No
tribe	Yes	No	No	No

As nouns, folk and tribe are synonyms defined as:

folk (noun)	tribe (noun)
the traditional and typically anonymous music that is an expression of the life of people in a community	a social division of (usually preliterate) people
people in general (often used in the plural)	a federation (as of American Indians)
a social division of (usually preliterate) people	group of people related by blood or marriage
people descended from a common ancestor	(biology) a taxonomic category between a genus and a subfamily