dallis grass vs dallisgrass

dallis grass and dallisgrass both are nouns.

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

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

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

Other synonyms of dallis grass include paspalum, Paspalum dilatatum.

dallis grass (noun)	dallisgrass (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