holm oak vs oak

holm oak and oak both are nouns.

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

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

holm 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 holm oak include oak tree.

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

holm oak: hard wood of the holm oak tree
oak: the hard durable wood of any oak; used especially for furniture and flooring

holm 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
hard wood of the holm oak tree	the hard durable wood of any oak; used especially for furniture and flooring