Louisville vs urban center

Louisville and urban center both are nouns.

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

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