Pope Gregory XII vs Gregory XII

Pope Gregory XII and Gregory XII both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pope Gregory XII	Yes	No	No	No
Gregory XII	Yes	No	No	No

As nouns, Pope Gregory XII and Gregory XII are synonyms defined as:

Pope Gregory XII and Gregory XII: the Italian pope from 1406 to 1415 who worked to end the Great Schism and who retired to make it possible (1327-1417)

Other synonyms of Pope Gregory XII include Angelo Correr, Gregory.

Pope Gregory XII (noun)	Gregory XII (noun)
the Italian pope from 1406 to 1415 who worked to end the Great Schism and who retired to make it possible (1327-1417)	the Italian pope from 1406 to 1415 who worked to end the Great Schism and who retired to make it possible (1327-1417)