blackseed vs smut grass

blackseed and smut grass both are nouns.

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

As nouns, blackseed and smut grass are synonyms defined as:

blackseed and smut grass: grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus

Other synonyms of blackseed include carpet grass, Sporobolus poiretii.

blackseed (noun)	smut grass (noun)
grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus	grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus