tribe vs taxon

tribe and taxon both are nouns.

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

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

Other hypernyms of tribe include taxonomic category, taxonomic group.

tribe (noun)	taxon (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