Saint Maarten vs island

Saint Maarten and island both are nouns.

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

Saint 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