pontificate vs Vicar of Christ

pontificate and Vicar of Christ both are nouns.

Word	Noun	Adjective	Verb	Adverb
pontificate	Yes	No	Yes	No
Vicar of Christ	Yes	No	No	No

pontificate (noun)	Vicar of Christ (noun)
the government of the Roman Catholic Church	the head of the Roman Catholic Church

pontificate (verb)	Vicar of Christ (verb)
talk in a dogmatic and pompous manner
administer a pontifical office