Antarctic Ocean vs Southern Ocean

Antarctic Ocean and Southern Ocean both are nouns.

Word	Noun	Adjective	Verb	Adverb
Antarctic Ocean	Yes	No	No	No
Southern Ocean	Yes	No	No	No

As nouns, Antarctic Ocean and Southern Ocean are synonyms defined as:

Antarctic Ocean and Southern Ocean: the southern waters surrounding Antarctica

Antarctic Ocean (noun)	Southern Ocean (noun)
the southern waters surrounding Antarctica	the southern waters surrounding Antarctica