alpine bearberry vs bearberry

alpine bearberry and bearberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
alpine bearberry	Yes	No	No	No
bearberry	Yes	No	No	No

As nouns, bearberry is a hypernym of alpine bearberry; that is, bearberry is a word with a broader meaning than alpine bearberry:

alpine bearberry: deciduous creeping shrub bright red in autumn having black or blue-black berries; alpine and circumpolar
bearberry: chiefly evergreen subshrubs of northern to Arctic areas

alpine bearberry (noun)	bearberry (noun)
deciduous creeping shrub bright red in autumn having black or blue-black berries; alpine and circumpolar	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