Betula papyrifera vs birch tree

Betula papyrifera and birch tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Betula papyrifera	Yes	No	No	No
birch tree	Yes	No	No	No

As nouns, birch tree is a hypernym of Betula papyrifera; that is, birch tree is a word with a broader meaning than Betula papyrifera:

Betula papyrifera: small American birch with peeling white bark often worked into e.g. baskets or toy canoes
birch tree: any betulaceous tree or shrub of the genus Betula having a thin peeling bark

Other hypernyms of Betula papyrifera include birch.

Betula papyrifera (noun)	birch tree (noun)
small American birch with peeling white bark often worked into e.g. baskets or toy canoes	any betulaceous tree or shrub of the genus Betula having a thin peeling bark