dallisgrass vs dallis grass

dallisgrass and dallis grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
dallisgrass	Yes	No	No	No
dallis grass	Yes	No	No	No

As nouns, dallisgrass and dallis grass are synonyms defined as:

dallisgrass and dallis grass: tall tufted perennial tropical American grass naturalized as pasture and forage grass in southern United States

Other synonyms of dallisgrass include paspalum, Paspalum dilatatum.

dallisgrass (noun)	dallis grass (noun)
tall tufted perennial tropical American grass naturalized as pasture and forage grass in southern United States	tall tufted perennial tropical American grass naturalized as pasture and forage grass in southern United States