paperbark birch vs paper birch

paperbark birch and paper birch both are nouns.

Word	Noun	Adjective	Verb	Adverb
paperbark birch	Yes	No	No	No
paper birch	Yes	No	No	No

As nouns, paperbark birch and paper birch are synonyms defined as:

paperbark birch and paper birch: small American birch with peeling white bark often worked into e.g. baskets or toy canoes

Other synonyms of paperbark birch include American white birch, Betula cordifolia, Betula papyrifera, canoe birch.

paperbark birch (noun)	paper birch (noun)
small American birch with peeling white bark often worked into e.g. baskets or toy canoes	small American birch with peeling white bark often worked into e.g. baskets or toy canoes