wood swallow vs oscine bird

wood swallow and oscine bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
wood swallow	Yes	No	No	No
oscine bird	Yes	No	No	No

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

wood swallow: Australasian and Asiatic bird related to the shrikes and resembling a swallow
oscine bird: passerine bird having specialized vocal apparatus

Other hypernyms of wood swallow include oscine.

wood swallow (noun)	oscine bird (noun)
Australasian and Asiatic bird related to the shrikes and resembling a swallow	passerine bird having specialized vocal apparatus