urban center vs Louisville

urban center and Louisville both are nouns.

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

urban center (noun)	Louisville (noun)
a large and densely populated urban area; may include several independent administrative districts	the largest city in Kentucky; located in north central Kentucky on the Ohio river; site of the Kentucky Derby