metropolis vs Omsk

metropolis and Omsk both are nouns.

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

metropolis (noun)	Omsk (noun)
people living in a large densely populated municipality	a city in the Asian part of Russia, Russia's seventh-largest city
a large and densely populated urban area; may include several independent administrative districts