Fijis vs island

Fijis and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fijis	Yes	No	No	No
island	Yes	No	No	No

Fijis (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