grass family vs genus Sporobolus

grass family and genus Sporobolus both are nouns.

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

grass family (noun)	genus Sporobolus (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	cosmopolitan annual and perennial grasses (as dropseed or rush grass)