Old World oriole vs oriole

Old World oriole and oriole both are nouns.

Word	Noun	Adjective	Verb	Adverb
Old World oriole	Yes	No	No	No
oriole	Yes	No	No	No

As nouns, Old World oriole and oriole are synonyms defined as:

Old World oriole and oriole: mostly tropical songbird; the male is usually bright orange and black

Old World oriole (noun)	oriole (noun)
mostly tropical songbird; the male is usually bright orange and black	American songbird; male is black and orange or yellow
	mostly tropical songbird; the male is usually bright orange and black