holm oak vs holm tree

holm oak and holm tree both are nouns.

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

As nouns, holm oak and holm tree are synonyms defined as:

holm oak and holm tree: evergreen oak of southern Europe having leaves somewhat resembling those of holly; yields a hard wood

Other synonyms of holm oak include evergreen oak, holly-leaved oak, Quercus ilex.

holm oak (noun)	holm tree (noun)
evergreen oak of southern Europe having leaves somewhat resembling those of holly; yields a hard wood	evergreen oak of southern Europe having leaves somewhat resembling those of holly; yields a hard wood
hard wood of the holm oak tree