metropolis vs Citta del Vaticano

metropolis and Citta del Vaticano both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Citta del Vaticano	Yes	No	No	No

metropolis (noun)	Citta del Vaticano (noun)
people living in a large densely populated municipality	the capital of the State of the Vatican City
a large and densely populated urban area; may include several independent administrative districts