island vs Fiji Islands

island and Fiji Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
Fiji Islands	Yes	No	No	No

island (noun)	Fiji Islands (noun)
a zone or area resembling an island	a group of more than 800 islands (100 inhabited) in the southwestern Pacific; larger islands (Viti Levu and Vanua Levu) are of volcanic origin surrounded by coral reefs; smaller islands are coral
a land mass (smaller than a continent) that is surrounded by water