Gulf of Aden vs Indian Ocean

Gulf of Aden and Indian Ocean both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gulf of Aden	Yes	No	No	No
Indian Ocean	Yes	No	No	No

Gulf of Aden (noun)	Indian Ocean (noun)
arm of the Indian Ocean at the entrance to the Red Sea	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