Turdus merula vs European blackbird

Turdus merula and European blackbird both are nouns.

Word	Noun	Adjective	Verb	Adverb
Turdus merula	Yes	No	No	No
European blackbird	Yes	No	No	No

As nouns, Turdus merula and European blackbird are synonyms defined as:

Other synonyms of Turdus merula include blackbird, merl, merle, ousel, ouzel.

Turdus merula (noun)	European blackbird (noun)
common black European thrush	common black European thrush