common bearberry vs mountain box

common bearberry and mountain box both are nouns.

Word	Noun	Adjective	Verb	Adverb
common bearberry	Yes	No	No	No
mountain box	Yes	No	No	No

As nouns, common bearberry and mountain box are synonyms defined as:

common bearberry and mountain box: evergreen mat-forming shrub of North America and northern Eurasia having small white flowers and red berries; leaves turn red in autumn

common bearberry (noun)	mountain box (noun)
evergreen mat-forming shrub of North America and northern Eurasia having small white flowers and red berries; leaves turn red in autumn	evergreen mat-forming shrub of North America and northern Eurasia having small white flowers and red berries; leaves turn red in autumn