finch vs oscine bird

finch and oscine bird both are nouns.

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

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

finch: any of numerous small songbirds with short stout bills adapted for crushing seeds
oscine bird: passerine bird having specialized vocal apparatus

Other hypernyms of finch include oscine.

finch (noun)	oscine bird (noun)
any of numerous small songbirds with short stout bills adapted for crushing seeds	passerine bird having specialized vocal apparatus