thrush vs oscine bird

thrush and oscine bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
thrush	Yes	No	No	No
oscine bird	Yes	No	No	No

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

thrush: songbirds characteristically having brownish upper plumage with a spotted breast
oscine bird: passerine bird having specialized vocal apparatus

Other hypernyms of thrush include oscine.

thrush (noun)	oscine bird (noun)
songbirds characteristically having brownish upper plumage with a spotted breast	passerine bird having specialized vocal apparatus
a woman who sings popular songs
candidiasis of the oral cavity; seen mostly in infants or debilitated adults