grass family vs genus Paspalum

grass family and genus Paspalum both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass family	Yes	No	No	No
genus Paspalum	Yes	No	No	No

grass family (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