tumble grass vs Panicum capillare

tumble grass and Panicum capillare both are nouns.

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

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

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

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

tumble grass (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