Poaceae vs family Graminaceae

Poaceae and family Graminaceae both are nouns.

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

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

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

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

Poaceae (noun)	family Graminaceae (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