merle vs Turdus merula

merle and Turdus merula both are nouns.

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

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

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

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