St. Peter the Apostle vs Saint Peter

St. Peter the Apostle and Saint Peter both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. Peter the Apostle	Yes	No	No	No
Saint Peter	Yes	No	No	No

As nouns, St. Peter the Apostle and Saint Peter are synonyms defined as:

St. Peter the Apostle and Saint 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 St. Peter the Apostle include Peter, Saint Peter the Apostle, Simon Peter, St. Peter.

St. Peter the Apostle (noun)	Saint 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