Indian Ocean vs Southern Ocean

Indian Ocean and Southern Ocean both are nouns.

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

Indian Ocean (noun)	Southern Ocean (noun)
the 3rd largest ocean; bounded by Africa on the west, Asia on the north, Australia on the east and merging with the Antarctic Ocean to the south	the southern waters surrounding Antarctica