Simon Peter vs St. Peter

Simon Peter and St. Peter both are nouns.

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

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

Simon Peter and St. Peter: disciple of Jesus and leader of the Apostles; regarded by Catholics as the vicar of Christ on earth and first Pope

Other synonyms of Simon Peter include Peter, Saint Peter, Saint Peter the Apostle, St. Peter the Apostle.

Simon Peter (noun)	St. Peter (noun)
disciple of Jesus and leader of the Apostles; regarded by Catholics as the vicar of Christ on earth and first Pope	disciple of Jesus and leader of the Apostles; regarded by Catholics as the vicar of Christ on earth and first Pope