European olive tree vs Olea europaea

European olive tree and Olea europaea both are nouns.

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

As nouns, European olive tree and Olea europaea are synonyms defined as:

European olive tree and Olea europaea: evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits

Other synonyms of European olive tree include olive.

European olive tree (noun)	Olea europaea (noun)
evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits	evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits