grass family vs family Poaceae

grass family and family Poaceae both are nouns.

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

As nouns, grass family and family Poaceae are synonyms defined as:

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

Other synonyms of grass family include family Graminaceae, family Gramineae, Graminaceae, Gramineae, Poaceae.

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