urban center vs Nizhny Novgorod

urban center and Nizhny Novgorod both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Nizhny Novgorod	Yes	No	No	No

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