rush nut vs sedge

rush nut and sedge both are nouns.

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

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

rush nut: 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

rush nut (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