dallis grass vs genus Paspalum

dallis grass and genus Paspalum both are nouns.

Word	Noun	Adjective	Verb	Adverb
dallis grass	Yes	No	No	No
genus Paspalum	Yes	No	No	No

dallis grass (noun)	genus Paspalum (noun)
tall tufted perennial tropical American grass naturalized as pasture and forage grass in southern United States	a genus of perennial grasses of warm regions