St. James vs Saint James

St. James and Saint James both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. James	Yes	No	No	No
Saint James	Yes	No	No	No

As nouns, St. James and Saint James are synonyms defined as:

St. James and Saint James: (New Testament) disciple of Jesus; brother of John; author of the Epistle of James in the New Testament

Other synonyms of St. James include James, Saint James the Apostle, St. James the Apostle.

St. James (noun)	Saint James (noun)
(New Testament) disciple of Jesus; brother of John; author of the Epistle of James in the New Testament	(New Testament) disciple of Jesus; brother of John; author of the Epistle of James in the New Testament