cascara buckthorn vs bearberry

cascara buckthorn and bearberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
cascara buckthorn	Yes	No	No	No
bearberry	Yes	No	No	No

As nouns, cascara buckthorn and bearberry are synonyms defined as:

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

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

cascara buckthorn (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