red bearberry vs bear's grape

red bearberry and bear's grape both are nouns.

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

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

red 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

red 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