couch grass vs quick grass

couch grass and quick grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
couch grass	Yes	No	No	No
quick grass	Yes	No	No	No

As nouns, couch grass and quick grass are synonyms defined as:

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

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

couch grass (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