Chiloe Archipelago vs island

Chiloe Archipelago and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chiloe Archipelago	Yes	No	No	No
island	Yes	No	No	No

Chiloe Archipelago (noun)	island (noun)
the largest Chilean island and the only one to be settled; located off south-central Chile	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water