Roman Catholic Pope vs Bishop of Rome

Roman Catholic Pope and Bishop of Rome both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman Catholic Pope	Yes	No	No	No
Bishop of Rome	Yes	No	No	No

As nouns, Roman Catholic Pope and Bishop of Rome are synonyms defined as:

Roman Catholic Pope and Bishop of Rome: the head of the Roman Catholic Church

Other synonyms of Roman Catholic Pope include Catholic Pope, Holy Father, pontiff, pope, Vicar of Christ.

Roman Catholic Pope (noun)	Bishop of Rome (noun)
the head of the Roman Catholic Church	the head of the Roman Catholic Church