Saint Olaf vs St. Olaf

Saint Olaf and St. Olaf both are nouns.

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

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

Other synonyms of Saint Olaf include Olaf II, Olaf II of Norway, Olav II, Saint Olav, St. Olav.

Saint Olaf (noun)	St. Olaf (noun)
King and patron saint of Norway (995-1030)	King and patron saint of Norway (995-1030)