Bishop of Rome vs Roman Catholic Pope

Bishop of Rome and Roman Catholic Pope both are nouns.

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

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

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

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

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