box white oak vs oak tree

box white oak and oak tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
box white oak	Yes	No	No	No
oak tree	Yes	No	No	No

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

box white oak: small deciduous tree of eastern and central United States having dark green lyrate pinnatifid leaves and tough moisture-resistant wood used especially for fence posts
oak tree: a deciduous tree of the genus Quercus; has acorns and lobed leaves

Other hypernyms of box white oak include oak.

box white oak (noun)	oak tree (noun)
small deciduous tree of eastern and central United States having dark green lyrate pinnatifid leaves and tough moisture-resistant wood used especially for fence posts	a deciduous tree of the genus Quercus; has acorns and lobed leaves