Bishop of Rome vs Albino Luciano

Bishop of Rome and Albino Luciano both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bishop of Rome	Yes	No	No	No
Albino Luciano	Yes	No	No	No

Bishop of Rome (noun)	Albino Luciano (noun)
the head of the Roman Catholic Church	the first Pope to assume a double name; he reigned for only 34 days (1912-1978)