Turdus merula vs blackbird

Turdus merula and blackbird both are nouns.

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

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

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

Turdus merula (noun)	blackbird (noun)
common black European thrush	any bird of the family Icteridae whose male is black or predominantly black
	common black European thrush