quackgrass vs quick grass

quackgrass and quick grass both are nouns.

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

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

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

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

quackgrass (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