Sporobolus vs smut grass

Sporobolus and smut grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sporobolus	Yes	No	No	No
smut grass	Yes	No	No	No

Sporobolus (noun)	smut grass (noun)
cosmopolitan annual and perennial grasses (as dropseed or rush grass)	grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus