nation vs tribe

nation and tribe both are nouns.

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

As nouns, tribe is a hyponym of nation; that is, tribe is a word with a more specific, narrower meaning than nation:

Other hyponyms of nation include federation of tribes.

nation (noun)	tribe (noun)
a politically organized body of people under a single government	a social division of (usually preliterate) people
the people who live in a nation or country	a federation (as of American Indians)
a federation of tribes (especially Native American tribes)	group of people related by blood or marriage
	(biology) a taxonomic category between a genus and a subfamily