Sint Maarten vs St. Martin

Sint Maarten and St. Martin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sint Maarten	Yes	No	No	No
St. Martin	Yes	No	No	No

As nouns, Sint Maarten and St. Martin are synonyms defined as:

Sint Maarten and St. Martin: an island in the western Leeward Islands; administered jointly by France and the Netherlands

Other synonyms of Sint Maarten include Saint Maarten, Saint Martin, St. Maarten.

Sint Maarten (noun)	St. Martin (noun)
an island in the western Leeward Islands; administered jointly by France and the Netherlands	an island in the western Leeward Islands; administered jointly by France and the Netherlands
	French bishop who is a patron saint of France (died in 397)