ouzel vs European blackbird

ouzel and European blackbird both are nouns.

Word	Noun	Adjective	Verb	Adverb
ouzel	Yes	No	No	No
European blackbird	Yes	No	No	No

As nouns, ouzel and European blackbird are synonyms defined as:

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

ouzel (noun)	European blackbird (noun)
common black European thrush	common black European thrush