ouzel vs blackbird

ouzel and blackbird both are nouns.

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

As nouns, ouzel and blackbird are synonyms defined as:

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

ouzel (noun)	blackbird (noun)
common black European thrush	any bird of the family Icteridae whose male is black or predominantly black
	common black European thrush