wool grass vs Scirpus cyperinus

wool grass and Scirpus cyperinus both are nouns.

Word	Noun	Adjective	Verb	Adverb
wool grass	Yes	No	No	No
Scirpus cyperinus	Yes	No	No	No

As nouns, wool grass and Scirpus cyperinus are synonyms defined as:

wool grass and Scirpus cyperinus: sedge of eastern North America having numerous clustered woolly spikelets

wool grass (noun)	Scirpus cyperinus (noun)
grass often cultivated for its long white-ribbed leaves and large plumes resembling those of pampas grass	sedge of eastern North America having numerous clustered woolly spikelets
sedge of eastern North America having numerous clustered woolly spikelets