Pacific Ocean vs New Guinea

Pacific Ocean and New Guinea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pacific Ocean	Yes	No	No	No
New Guinea	Yes	No	No	No

Pacific Ocean (noun)	New Guinea (noun)
the largest ocean in the world	a Pacific island to the north of Australia; the 2nd largest island in the world; the western part is governed by Indonesia and the eastern part is Papua New Guinea