Roman Catholic Pope vs Holy Father

Roman Catholic Pope and Holy Father both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman Catholic Pope	Yes	No	No	No
Holy Father	Yes	No	No	No

As nouns, Roman Catholic Pope and Holy Father are synonyms defined as:

Roman Catholic Pope and Holy Father: the head of the Roman Catholic Church

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

Roman Catholic Pope (noun)	Holy Father (noun)
the head of the Roman Catholic Church	the head of the Roman Catholic Church