merle vs ouzel

merle and ouzel both are nouns.

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

As nouns, merle and ouzel are synonyms defined as:

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

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