metropolis vs Kaluga

metropolis and Kaluga both are nouns.

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

metropolis (noun)	Kaluga (noun)
people living in a large densely populated municipality	a city of central Russia to the south of Moscow
a large and densely populated urban area; may include several independent administrative districts