wintergreen oil vs oil of wintergreen

wintergreen oil and oil of wintergreen both are nouns.

Word	Noun	Adjective	Verb	Adverb
wintergreen oil	Yes	No	No	No
oil of wintergreen	Yes	No	No	No

As nouns, wintergreen oil and oil of wintergreen are synonyms defined as:

wintergreen oil and oil of wintergreen: oil or flavoring obtained from the creeping wintergreen or teaberry plant

wintergreen oil (noun)	oil of wintergreen (noun)
oil or flavoring obtained from the creeping wintergreen or teaberry plant	oil or flavoring obtained from the creeping wintergreen or teaberry plant