metropolis vs Nagano

metropolis and Nagano both are nouns.

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

metropolis (noun)	Nagano (noun)
people living in a large densely populated municipality	a city in central Honshu to the northwest of Tokyo; site of a Buddhist shrine
a large and densely populated urban area; may include several independent administrative districts