witchgrass vs witch grass

witchgrass and witch grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
witchgrass	Yes	No	No	No
witch grass	Yes	No	No	No

As nouns, witchgrass and witch grass are synonyms defined as:

witchgrass and witch grass: North American grass with slender brushy panicles; often a weed on cultivated land

Other synonyms of witchgrass include old witch grass, old witchgrass, Panicum capillare, tumble grass.

As nouns, witchgrass and witch grass are synonyms defined as:

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

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

witchgrass (noun)	witch grass (noun)
North American grass with slender brushy panicles; often a weed on cultivated land	North American grass with slender brushy panicles; often a weed on cultivated land
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