WordNet sense 1 ((New Testament) disciple of Jesus; traditionally said to be the author of the 4th Gospel and three epistles and the book of Revelation):

john, St. John, John the Divine, John the Evangelist, Saint John the Apostle, St. John the Apostle

WordNet sense 2 (a river that rises in Maine and flows northeastward through New Brunswick to empty into the Bay of Fundy):

Saint John River, St. John River