wool grass vs Erianthus ravennae

wool grass and Erianthus ravennae both are nouns.

Word	Noun	Adjective	Verb	Adverb
wool grass	Yes	No	No	No
Erianthus ravennae	Yes	No	No	No

As nouns, wool grass and Erianthus ravennae are synonyms defined as:

wool grass and Erianthus ravennae: grass often cultivated for its long white-ribbed leaves and large plumes resembling those of pampas grass

Other synonyms of wool grass include Ravenna grass.

wool grass (noun)	Erianthus ravennae (noun)
grass often cultivated for its long white-ribbed leaves and large plumes resembling those of pampas grass	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