mountain box vs bear's grape

mountain box and bear's grape both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain box	Yes	No	No	No
bear's grape	Yes	No	No	No

As nouns, mountain box and bear's grape are synonyms defined as:

mountain box 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

mountain box (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