island vs Vanua Levu

island and Vanua Levu both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
Vanua Levu	Yes	No	No	No

island (noun)	Vanua Levu (noun)
a zone or area resembling an island	a volcanic island in the Fijis, the second-largest island in Fiji
a land mass (smaller than a continent) that is surrounded by water