Bishop of Rome vs Giulio de' Medici

Bishop of Rome and Giulio de' Medici both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bishop of Rome	Yes	No	No	No
Giulio de' Medici	Yes	No	No	No

Bishop of Rome (noun)	Giulio de' Medici (noun)
the head of the Roman Catholic Church	Italian pope from 1523 to 1534 who broke with Henry VIII of England after Henry VIII divorced Catherine of Aragon and married Anne Boleyn (1478-1534)