dog grass vs quick grass

dog grass and quick grass both are nouns.

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

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

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

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

dog 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