witchgrass vs Panicum capillare

witchgrass and Panicum capillare both are nouns.

Word	Noun	Adjective	Verb	Adverb
witchgrass	Yes	No	No	No
Panicum capillare	Yes	No	No	No

As nouns, witchgrass and Panicum capillare are synonyms defined as:

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

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

witchgrass (noun)	Panicum capillare (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