Vicar of Christ vs Gregory VII

Vicar of Christ and Gregory VII both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vicar of Christ	Yes	No	No	No
Gregory VII	Yes	No	No	No

Vicar of Christ (noun)	Gregory VII (noun)
the head of the Roman Catholic Church	the Italian pope who fought to establish the supremacy of the pope over the Roman Catholic Church and the supremacy of the church over the state (1020-1085)