Poaceae vs Glyceria

Poaceae and Glyceria both are nouns.

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

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