Aegadian Islands vs island

Aegadian Islands and island both are nouns.

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

Aegadian Islands (noun)	island (noun)
islands west of Sicily (now known as the Egadi Islands) where the Romans won a naval victory over the Carthaginians that ended the first Punic War in 241 BC	a zone or area resembling an island
a group of islands off the west coast of Sicily in the Mediterranean	a land mass (smaller than a continent) that is surrounded by water