Chelyabinsk vs urban center

Chelyabinsk and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chelyabinsk	Yes	No	No	No
urban center	Yes	No	No	No

Chelyabinsk (noun)	urban center (noun)
a city in the Asian part of Russia, named after the fortress of Chelyaba	a large and densely populated urban area; may include several independent administrative districts