nuthatch vs oscine bird

nuthatch and oscine bird both are nouns.

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

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

nuthatch: any of various small short-tailed songbirds with strong feet and a sharp beak that feed on small nuts and insects
oscine bird: passerine bird having specialized vocal apparatus

Other hypernyms of nuthatch include oscine.

nuthatch (noun)	oscine bird (noun)
any of various small short-tailed songbirds with strong feet and a sharp beak that feed on small nuts and insects	passerine bird having specialized vocal apparatus