ouzel vs merle

ouzel and merle both are nouns.

Word	Noun	Adjective	Verb	Adverb
ouzel	Yes	No	No	No
merle	Yes	No	No	No

As nouns, ouzel and merle are synonyms defined as:

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

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