Simon vs St. Simon

Simon and St. Simon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Simon	Yes	No	No	No
St. Simon	Yes	No	No	No

As nouns, Simon and St. Simon are synonyms defined as:

Other synonyms of Simon include Simon the Canaanite, Simon the Zealot, Simon Zelotes.

Simon (noun)	St. Simon (noun)
United States economist and psychologist who pioneered in the development of cognitive science (1916-2001)	one of the twelve Apostles (first century)
United States playwright noted for light comedies (born in 1927)
United States singer and songwriter (born in 1942)
one of the twelve Apostles (first century)