Agropyron repens vs quack grass

Agropyron repens and quack grass both are nouns.

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

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

Agropyron repens and quack 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, quackgrass, quick grass, witch grass, witchgrass.

Agropyron repens (noun)	quack 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