Oregon white oak vs Oregon oak

Oregon white oak and Oregon oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oregon white oak	Yes	No	No	No
Oregon oak	Yes	No	No	No

As nouns, Oregon white oak and Oregon oak are synonyms defined as:

Oregon white oak and Oregon oak: small deciduous tree of western North America with crooked branches and pale grey bark

Other synonyms of Oregon white oak include Garry oak, Quercus garryana.

Oregon white oak (noun)	Oregon oak (noun)
small deciduous tree of western North America with crooked branches and pale grey bark	small deciduous tree of western North America with crooked branches and pale grey bark