blackbird vs thrush

blackbird and thrush both are nouns.

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

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

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

blackbird (noun)	thrush (noun)
any bird of the family Icteridae whose male is black or predominantly black	songbirds characteristically having brownish upper plumage with a spotted breast
common black European thrush	a woman who sings popular songs
	candidiasis of the oral cavity; seen mostly in infants or debilitated adults