Mauritius vs island

Mauritius and island both are nouns.

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

Mauritius (noun)	island (noun)
a parliamentary state on the island of Mauritius	a zone or area resembling an island
an island in the southwestern Indian Ocean	a land mass (smaller than a continent) that is surrounded by water