yellow nutgrass vs sedge

yellow nutgrass and sedge both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow nutgrass	Yes	No	No	No
sedge	Yes	No	No	No

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

yellow nutgrass: European 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

yellow nutgrass (noun)	sedge (noun)
European 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