Avena vs Poaceae

Avena and Poaceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Avena	Yes	No	No	No
Poaceae	Yes	No	No	No

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