archipelago vs island

archipelago and island both are nouns.

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

archipelago (noun)	island (noun)
a group of many islands in a large body of water	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water