thin-leaved bilberry vs mountain blue berry

thin-leaved bilberry and mountain blue berry both are nouns.

Word	Noun	Adjective	Verb	Adverb
thin-leaved bilberry	Yes	No	No	No
mountain blue berry	Yes	No	No	No

As nouns, thin-leaved bilberry and mountain blue berry are synonyms defined as:

thin-leaved bilberry and mountain blue berry: erect blueberry of western United States having solitary flowers and somewhat sour berries

Other synonyms of thin-leaved bilberry include bilberry, Viccinium membranaceum.

thin-leaved bilberry (noun)	mountain blue berry (noun)
erect blueberry of western United States having solitary flowers and somewhat sour berries	erect blueberry of western United States having solitary flowers and somewhat sour berries