Agropyron repens vs quackgrass

Agropyron repens and quackgrass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Agropyron repens	Yes	No	No	No
quackgrass	Yes	No	No	No

As nouns, Agropyron repens and quackgrass are synonyms defined as:

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

Agropyron repens (noun)	quackgrass (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