WordNet is a kind of online English language database. The words are grouped into synonyms and definitions are provided. One could say WordNet combines a dictionary and thesaurus.

John the Baptist is not the patron saint of teachers.

No, John Coltrane is not a canonized saint.

Which Saint John? There are over 100 saints named John.

Saint John can either refer to John the Baptist or John the Apostle. However, John the Baptist is more commonly referred to as Saint John.