nutgrass vs Cyperus rotundus

nutgrass and Cyperus rotundus both are nouns.

Word	Noun	Adjective	Verb	Adverb
nutgrass	Yes	No	No	No
Cyperus rotundus	Yes	No	No	No

As nouns, nutgrass and Cyperus rotundus are synonyms defined as:

nutgrass and Cyperus rotundus: a widely distributed perennial sedge having small edible nutlike tubers

Other synonyms of nutgrass include nut grass, nut sedge, nutsedge.

nutgrass (noun)	Cyperus rotundus (noun)
a widely distributed perennial sedge having small edible nutlike tubers	a widely distributed perennial sedge having small edible nutlike tubers