cascara buckthorn vs Rhamnus purshianus

cascara buckthorn and Rhamnus purshianus both are nouns.

Word	Noun	Adjective	Verb	Adverb
cascara buckthorn	Yes	No	No	No
Rhamnus purshianus	Yes	No	No	No

As nouns, cascara buckthorn and Rhamnus purshianus are synonyms defined as:

cascara buckthorn and Rhamnus purshianus: shrubby tree of the Pacific coast of the United States; yields cascara sagrada

Other synonyms of cascara buckthorn include bearberry, bearwood, chittamwood, chittimwood.

cascara buckthorn (noun)	Rhamnus purshianus (noun)
shrubby tree of the Pacific coast of the United States; yields cascara sagrada	shrubby tree of the Pacific coast of the United States; yields cascara sagrada