bearberry vs holly

bearberry and holly both are nouns.

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

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

bearberry: deciduous shrub of southeastern and central United States
holly: any tree or shrub of the genus Ilex having red berries and shiny evergreen leaves with prickly edges

bearberry (noun)	holly (noun)
chiefly evergreen subshrubs of northern to Arctic areas	any tree or shrub of the genus Ilex having red berries and shiny evergreen leaves with prickly edges
deciduous shrub of southeastern and central United States
shrubby tree of the Pacific coast of the United States; yields cascara sagrada