mockingbird vs oscine

mockingbird and oscine both are nouns.

Word	Noun	Adjective	Verb	Adverb
mockingbird	Yes	No	No	No
oscine	Yes	Yes	No	No

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

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

Other hypernyms of mockingbird include oscine bird.

mockingbird (noun)	oscine (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

mockingbird (adjective)	oscine (adjective)
	of or relating to the songbirds