Agropyron repens vs quick grass

Agropyron repens and quick grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Agropyron repens	Yes	No	No	No
quick grass	Yes	No	No	No

As nouns, Agropyron repens and quick grass are synonyms defined as:

Agropyron repens and quick grass: European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed

Other synonyms of Agropyron repens include couch grass, dog grass, quack grass, quackgrass, witch grass, witchgrass.

Agropyron repens (noun)	quick grass (noun)
European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed	European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed