urban center vs Citta del Vaticano

urban center and Citta del Vaticano both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Citta del Vaticano	Yes	No	No	No

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