Olea europaea vs olive tree

Olea europaea and olive tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Olea europaea	Yes	No	No	No
olive tree	Yes	No	No	No

As nouns, olive tree is a hypernym of Olea europaea; that is, olive tree is a word with a broader meaning than Olea europaea:

Olea europaea: evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits
olive tree: a tree of the genus Olea cultivated for its fruit

Olea europaea (noun)	olive tree (noun)
evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits	a tree of the genus Olea cultivated for its fruit