metropolis vs Naples

metropolis and Naples both are nouns.

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

metropolis (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