Poa vs Poaceae

Poa and Poaceae both are nouns.

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

Poa (noun)	Poaceae (noun)
chiefly perennial grasses of cool temperate regions	the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane