St. Leo I vs Leo I

St. Leo I and Leo I both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. Leo I	Yes	No	No	No
Leo I	Yes	No	No	No

As nouns, St. Leo I and Leo I are synonyms defined as:

St. Leo I and Leo I: Italian pope from 400 to 461 who extended the authority of the papacy to the west and persuaded Attila not to attack Rome (400-461)

Other synonyms of St. Leo I include Leo the Great, Pope Leo I.

St. Leo I (noun)	Leo I (noun)
Italian pope from 400 to 461 who extended the authority of the papacy to the west and persuaded Attila not to attack Rome (400-461)	Italian pope from 400 to 461 who extended the authority of the papacy to the west and persuaded Attila not to attack Rome (400-461)