tribe vs taxonomic group

tribe and taxonomic group both are nouns.

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

As nouns, taxonomic group is a hypernym of tribe; that is, taxonomic group is a word with a broader meaning than tribe:

Other hypernyms of tribe include taxon, taxonomic category.

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