Calamagrostis vs grass family

Calamagrostis and grass family both are nouns.

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

As nouns, grass family is a hypernym of Calamagrostis; that is, grass family is a word with a broader meaning than Calamagrostis:

Calamagrostis: reed grass
grass family: the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane

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