wool grass vs Ravenna grass

wool grass and Ravenna grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
wool grass	Yes	No	No	No
Ravenna grass	Yes	No	No	No

As nouns, wool grass and Ravenna grass are synonyms defined as:

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

Other synonyms of wool grass include Erianthus ravennae.

wool grass (noun)	Ravenna grass (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