nut sedge vs sedge

nut sedge and sedge both are nouns.

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

As nouns, sedge is a hypernym of nut sedge; that is, sedge is a word with a broader meaning than nut sedge:

nut sedge: a widely distributed perennial sedge having small edible nutlike tubers
sedge: grasslike or rushlike plant growing in wet places having solid stems, narrow grasslike leaves and spikelets of inconspicuous flowers

nut sedge (noun)	sedge (noun)
a widely distributed perennial sedge having small edible nutlike tubers	grasslike or rushlike plant growing in wet places having solid stems, narrow grasslike leaves and spikelets of inconspicuous flowers