Gramineae vs Schizachyrium

Gramineae and Schizachyrium both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gramineae	Yes	No	No	No
Schizachyrium	Yes	No	No	No

Gramineae (noun)	Schizachyrium (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	overlaps the genus Andropogon