Andrew vs Saint Andrew

Andrew and Saint Andrew both are nouns.

Word	Noun	Adjective	Verb	Adverb
Andrew	Yes	No	No	No
Saint Andrew	Yes	No	No	No

As nouns, Andrew and Saint Andrew are synonyms defined as:

Andrew and Saint Andrew: (New Testament) disciple of Jesus; brother of Peter; patron saint of Scotland

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

Andrew (noun)	Saint Andrew (noun)
(New Testament) disciple of Jesus; brother of Peter; patron saint of Scotland	(New Testament) disciple of Jesus; brother of Peter; patron saint of Scotland