Indian Ocean vs Seychelles islands

Indian Ocean and Seychelles islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
Indian Ocean	Yes	No	No	No
Seychelles islands	Yes	No	No	No

Indian Ocean (noun)	Seychelles islands (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	a group of about 90 islands in the western Indian Ocean to the north of Madagascar