family Poaceae vs genus Arrhenatherum

family Poaceae and genus Arrhenatherum both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Poaceae	Yes	No	No	No
genus Arrhenatherum	Yes	No	No	No

family Poaceae (noun)	genus Arrhenatherum (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	oat grass