Panicum capillare vs tumble grass

Panicum capillare and tumble grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Panicum capillare	Yes	No	No	No
tumble grass	Yes	No	No	No

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

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

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

Panicum capillare (noun)	tumble 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