grass family vs genus Panicum

grass family and genus Panicum both are nouns.

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

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