nut sedge vs nut grass

nut sedge and nut grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
nut sedge	Yes	No	No	No
nut grass	Yes	No	No	No

As nouns, nut sedge and nut grass are synonyms defined as:

nut sedge and nut grass: a widely distributed perennial sedge having small edible nutlike tubers

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

nut sedge (noun)	nut grass (noun)
a widely distributed perennial sedge having small edible nutlike tubers	a widely distributed perennial sedge having small edible nutlike tubers