mocker vs oscine bird

mocker and oscine bird both are nouns.

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

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

mocker: long-tailed grey-and-white songbird of the southern United States able to mimic songs of other birds
oscine bird: passerine bird having specialized vocal apparatus

Other hypernyms of mocker include oscine.

mocker (noun)	oscine bird (noun)
long-tailed grey-and-white songbird of the southern United States able to mimic songs of other birds	passerine bird having specialized vocal apparatus
someone who jeers or mocks or treats something with contempt or calls out in derision