Panicum capillare vs old witch grass

Panicum capillare and old witch grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Panicum capillare	Yes	No	No	No
old witch grass	Yes	No	No	No

As nouns, Panicum capillare and old witch grass are synonyms defined as:

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

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

Panicum capillare (noun)	old 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