Fiji Islands vs island

Fiji Islands and island both are nouns.

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

Fiji Islands (noun)	island (noun)
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 zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water