vireo vs oscine bird

vireo and oscine bird both are nouns.

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

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

vireo: any of various small insectivorous American birds chiefly olive-grey in color
oscine bird: passerine bird having specialized vocal apparatus

Other hypernyms of vireo include oscine.

vireo (noun)	oscine bird (noun)
any of various small insectivorous American birds chiefly olive-grey in color	passerine bird having specialized vocal apparatus