paper birch vs paperbark birch

paper birch and paperbark birch both are nouns.

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

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

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

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

paper birch (noun)	paperbark 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