mountain cranberry vs lowbush cranberry

mountain cranberry and lowbush cranberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain cranberry	Yes	No	No	No
lowbush cranberry	Yes	No	No	No

As nouns, mountain cranberry and lowbush cranberry are synonyms defined as:

mountain cranberry and lowbush cranberry: tart red berries similar to American cranberries but smaller

Other synonyms of mountain cranberry include cowberry, lingonberry.

mountain cranberry (noun)	lowbush cranberry (noun)
tart red berries similar to American cranberries but smaller	tart red berries similar to American cranberries but smaller
low evergreen shrub of high north temperate regions of Europe and Asia and America bearing red edible berries