Quercus imbricaria vs oak tree

Quercus imbricaria and oak tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Quercus imbricaria	Yes	No	No	No
oak tree	Yes	No	No	No

As nouns, oak tree is a hypernym of Quercus imbricaria; that is, oak tree is a word with a broader meaning than Quercus imbricaria:

Quercus imbricaria: small deciduous tree of eastern and central United States having leaves that shine like laurel; wood is used in western states for shingles
oak tree: a deciduous tree of the genus Quercus; has acorns and lobed leaves

Other hypernyms of Quercus imbricaria include oak.

Quercus imbricaria (noun)	oak tree (noun)
small deciduous tree of eastern and central United States having leaves that shine like laurel; wood is used in western states for shingles	a deciduous tree of the genus Quercus; has acorns and lobed leaves