common bearberry vs bear's grape

common bearberry and bear's grape both are nouns.

Word	Noun	Adjective	Verb	Adverb
common bearberry	Yes	No	No	No
bear's grape	Yes	No	No	No

As nouns, common bearberry and bear's grape are synonyms defined as:

common bearberry and bear's grape: 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)	bear's grape (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