island vs Saint Martin

island and Saint Martin both are nouns.

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

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