paper plant vs sedge

paper plant and sedge both are nouns.

Word	Noun	Adjective	Verb	Adverb
paper plant	Yes	No	No	No
sedge	Yes	No	No	No

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

paper plant: tall sedge of the Nile valley yielding fiber that served many purposes in historic times
sedge: grasslike or rushlike plant growing in wet places having solid stems, narrow grasslike leaves and spikelets of inconspicuous flowers

paper plant (noun)	sedge (noun)
tall sedge of the Nile valley yielding fiber that served many purposes in historic times	grasslike or rushlike plant growing in wet places having solid stems, narrow grasslike leaves and spikelets of inconspicuous flowers