ousel vs thrush

ousel and thrush both are nouns.

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

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

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

ousel (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