Poaceae vs genus Paspalum

Poaceae and genus Paspalum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Poaceae	Yes	No	No	No
genus Paspalum	Yes	No	No	No

Poaceae (noun)	genus Paspalum (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	a genus of perennial grasses of warm regions