oriole vs Old World oriole

oriole and Old World oriole both are nouns.

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

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

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

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