Sardegna vs island

Sardegna and island both are nouns.

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

Sardegna (noun)	island (noun)
the Italian region on the island of Sardinia; the kingdom of Sardinia was the nucleus for uniting Italy during the 19th century	a zone or area resembling an island
an island in the Mediterranean to the west of Italy	a land mass (smaller than a continent) that is surrounded by water