urban center vs Chelyabinsk

urban center and Chelyabinsk both are nouns.

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

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