urban center vs Kimberley

urban center and Kimberley both are nouns.

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

urban center (noun)	Kimberley (noun)
a large and densely populated urban area; may include several independent administrative districts	city in central South Africa; center for diamond mining and diamond marketing