Vicar of Christ vs Albino Luciano

Vicar of Christ and Albino Luciano both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vicar of Christ	Yes	No	No	No
Albino Luciano	Yes	No	No	No

Vicar of Christ (noun)	Albino Luciano (noun)
the head of the Roman Catholic Church	the first Pope to assume a double name; he reigned for only 34 days (1912-1978)