Poaceae vs genus Saccharum

Poaceae and genus Saccharum both are nouns.

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

Poaceae (noun)	genus Saccharum (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	tall perennial reedlike grass originally of southeastern Asia: sugarcane