holm tree vs holm oak

holm tree and holm oak both are nouns.

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

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

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

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

holm tree (noun)	holm oak (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