ouzel vs thrush

ouzel and thrush both are nouns.

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

As nouns, thrush is a hypernym of ouzel; that is, thrush is a word with a broader meaning than ouzel:

ouzel: common black European thrush
thrush: songbirds characteristically having brownish upper plumage with a spotted breast

ouzel (noun)	thrush (noun)
common black European thrush	songbirds characteristically having brownish upper plumage with a spotted breast
	a woman who sings popular songs
	candidiasis of the oral cavity; seen mostly in infants or debilitated adults