metropolis vs Nizhnyi Novgorod

metropolis and Nizhnyi Novgorod both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Nizhnyi Novgorod	Yes	No	No	No

metropolis (noun)	Nizhnyi Novgorod (noun)
people living in a large densely populated municipality	an industrial city in the European part of Russia; birthplace of Maksim Gorky
a large and densely populated urban area; may include several independent administrative districts