Sint Maarten vs island

Sint Maarten and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sint Maarten	Yes	No	No	No
island	Yes	No	No	No

Sint Maarten (noun)	island (noun)
an island in the western Leeward Islands; administered jointly by France and the Netherlands	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water