grass family vs meadowgrass

grass family and meadowgrass both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass family	Yes	No	No	No
meadowgrass	Yes	No	No	No

grass family (noun)	meadowgrass (noun)
the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane	any of various grasses that thrive in the presence of abundant moisture