bear's grape vs red bearberry

bear's grape and red bearberry both are nouns.

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

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

bear's grape and red bearberry: evergreen mat-forming shrub of North America and northern Eurasia having small white flowers and red berries; leaves turn red in autumn

bear's grape (noun)	red bearberry (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