tribe vs biological science

tribe and biological science both are nouns.

Word	Noun	Adjective	Verb	Adverb
tribe	Yes	No	No	No
biological science	Yes	No	No	No

tribe (noun)	biological science (noun)
a social division of (usually preliterate) people	the science that studies living organisms
a federation (as of American Indians)
group of people related by blood or marriage
(biology) a taxonomic category between a genus and a subfamily