Rhamnus purshianus vs bearberry

Rhamnus purshianus and bearberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rhamnus purshianus	Yes	No	No	No
bearberry	Yes	No	No	No

As nouns, Rhamnus purshianus and bearberry are synonyms defined as:

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

Other synonyms of Rhamnus purshianus include bearwood, cascara buckthorn, chittamwood, chittimwood.

Rhamnus purshianus (noun)	bearberry (noun)
shrubby tree of the Pacific coast of the United States; yields cascara sagrada	chiefly evergreen subshrubs of northern to Arctic areas
	deciduous shrub of southeastern and central United States
	shrubby tree of the Pacific coast of the United States; yields cascara sagrada