Cyperus rotundus vs nutgrass

Cyperus rotundus and nutgrass both are nouns.

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

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

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

Other synonyms of Cyperus rotundus include nut grass, nut sedge, nutsedge.

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