Catholic Pope vs Vicar of Christ

Catholic Pope and Vicar of Christ both are nouns.

Word	Noun	Adjective	Verb	Adverb
Catholic Pope	Yes	No	No	No
Vicar of Christ	Yes	No	No	No

As nouns, Catholic Pope and Vicar of Christ are synonyms defined as:

Catholic Pope and Vicar of Christ: the head of the Roman Catholic Church

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

Catholic Pope (noun)	Vicar of Christ (noun)
the head of the Roman Catholic Church	the head of the Roman Catholic Church