St. Martin vs St. Maarten

St. Martin and St. Maarten both are nouns.

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

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

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

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

St. Martin (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
French bishop who is a patron saint of France (died in 397)