tribe vs kinship group

tribe and kinship group both are nouns.

Word	Noun	Adjective	Verb	Adverb
tribe	Yes	No	No	No
kinship group	Yes	No	No	No

As nouns, tribe and kinship group are synonyms defined as:

Other synonyms of tribe include clan, kin, kin group, kindred.

tribe (noun)	kinship group (noun)
a social division of (usually preliterate) people	group of people related by blood or marriage
a federation (as of American Indians)
group of people related by blood or marriage
(biology) a taxonomic category between a genus and a subfamily