Corsica vs island

Corsica and island both are nouns.

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

Corsica (noun)	island (noun)
a region of France on the island of Corsica; birthplace of Napoleon Bonaparte	a zone or area resembling an island
an island in the Mediterranean; with adjacent islets it constitutes a region of France	a land mass (smaller than a continent) that is surrounded by water