genus Avena vs Gramineae

genus Avena and Gramineae both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Avena	Yes	No	No	No
Gramineae	Yes	No	No	No

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