family Poaceae vs tribe Bambuseae

family Poaceae and tribe Bambuseae both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Poaceae	Yes	No	No	No
tribe Bambuseae	Yes	No	No	No

family Poaceae (noun)	tribe Bambuseae (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	bamboos