Bishop of Rome vs pontificate

Bishop of Rome and pontificate both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bishop of Rome	Yes	No	No	No
pontificate	Yes	No	Yes	No

Bishop of Rome (noun)	pontificate (noun)
the head of the Roman Catholic Church	the government of the Roman Catholic Church

Bishop of Rome (verb)	pontificate (verb)
	talk in a dogmatic and pompous manner
	administer a pontifical office