Saint Maarten vs St. Maarten

Saint Maarten and St. Maarten both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Maarten	Yes	No	No	No
St. Maarten	Yes	No	No	No

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

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

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

Saint Maarten (noun)	St. Maarten (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