Turdus merula vs ousel

Turdus merula and ousel both are nouns.

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

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

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

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