Rhamnus purshianus vs cascara buckthorn

Rhamnus purshianus and cascara buckthorn both are nouns.

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

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

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

Other synonyms of Rhamnus purshianus include bearberry, bearwood, chittamwood, chittimwood.

Rhamnus purshianus (noun)	cascara buckthorn (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