Citta del Vaticano vs city

Citta del Vaticano and city both are nouns.

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

Citta del Vaticano (noun)	city (noun)
the capital of the State of the Vatican City	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts
	an incorporated administrative district established by state charter