island vs Ischia

island and Ischia both are nouns.

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

island (noun)	Ischia (noun)
a zone or area resembling an island	a volcanic island (part of Campania) in the Tyrrhenian Sea at the north end of the Bay of Naples
a land mass (smaller than a continent) that is surrounded by water