Avena fatua vs wild oat grass

Avena fatua and wild oat grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Avena fatua	Yes	No	No	No
wild oat grass	Yes	No	No	No

As nouns, Avena fatua and wild oat grass are synonyms defined as:

Other synonyms of Avena fatua include wild oat.

Avena fatua (noun)	wild oat grass (noun)
common in meadows and pastures	common in meadows and pastures