meadowgrass vs grass family

meadowgrass and grass family both are nouns.

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

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