Aran Islands vs island

Aran Islands and island both are nouns.

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

Aran Islands (noun)	island (noun)
three small islands belonging to Ireland at the entrance to Galway Bay	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water