family Gramineae vs Zizania

family Gramineae and Zizania both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Gramineae	Yes	No	No	No
Zizania	Yes	No	No	No

family Gramineae (noun)	Zizania (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	wild rice