Ugo Buoncompagni vs Gregory XIII

Ugo Buoncompagni and Gregory XIII both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ugo Buoncompagni	Yes	No	No	No
Gregory XIII	Yes	No	No	No

As nouns, Ugo Buoncompagni and Gregory XIII are synonyms defined as:

Ugo Buoncompagni and Gregory XIII: the pope who sponsored the introduction of the modern calendar (1572-1585)

Other synonyms of Ugo Buoncompagni include Gregory, Pope Gregory XIII.

Ugo Buoncompagni (noun)	Gregory XIII (noun)
the pope who sponsored the introduction of the modern calendar (1572-1585)	the pope who sponsored the introduction of the modern calendar (1572-1585)