St. Martin vs Martin of Tours

St. Martin and Martin of Tours both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. Martin	Yes	No	No	No
Martin of Tours	Yes	No	No	No

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

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

Other synonyms of St. Martin include Martin.

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