holly-leaved oak vs oak

holly-leaved oak and oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
holly-leaved oak	Yes	No	No	No
oak	Yes	No	No	No

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

holly-leaved 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 holly-leaved oak include oak tree.

holly-leaved 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