city vs Naples

city and Naples both are nouns.

Word	Noun	Adjective	Verb	Adverb
city	Yes	No	No	No
Naples	Yes	No	No	No

city (noun)	Naples (noun)
people living in a large densely populated municipality	a port and tourist center in southwestern Italy; capital of the Campania region
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter