evergreen oak vs oak

evergreen oak and oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
evergreen oak	Yes	No	No	No
oak	Yes	No	No	No

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

evergreen oak: evergreen oak of southern Europe having leaves somewhat resembling those of holly; yields a hard wood
oak: a deciduous tree of the genus Quercus; has acorns and lobed leaves

Other hypernyms of evergreen oak include oak tree.

evergreen oak (noun)	oak (noun)
evergreen oak of southern Europe having leaves somewhat resembling those of holly; yields a hard wood	a deciduous tree of the genus Quercus; has acorns and lobed leaves
	the hard durable wood of any oak; used especially for furniture and flooring