Bishop of Rome vs Enea Silvio Piccolomini

Bishop of Rome and Enea Silvio Piccolomini both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bishop of Rome	Yes	No	No	No
Enea Silvio Piccolomini	Yes	No	No	No

Bishop of Rome (noun)	Enea Silvio Piccolomini (noun)
the head of the Roman Catholic Church	Italian pope from 1458 to 1464 who is remembered for his unsuccessful attempt to lead a crusade against the Turks (1405-1464)