St. Patrick vs Saint Patrick

St. Patrick and Saint Patrick both are nouns.

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

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

St. Patrick and Saint Patrick: Apostle and patron saint of Ireland; an English missionary to Ireland in the 5th century

Other synonyms of St. Patrick include Patrick.

St. Patrick (noun)	Saint Patrick (noun)
Apostle and patron saint of Ireland; an English missionary to Ireland in the 5th century	Apostle and patron saint of Ireland; an English missionary to Ireland in the 5th century