oscine bird vs oscine

oscine bird and oscine both are nouns.

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

As nouns, oscine bird and oscine are synonyms defined as:

oscine bird and oscine: passerine bird having specialized vocal apparatus

oscine bird (noun)	oscine (noun)
passerine bird having specialized vocal apparatus	passerine bird having specialized vocal apparatus

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