urban center vs Milwaukee

urban center and Milwaukee both are nouns.

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

urban center (noun)	Milwaukee (noun)
a large and densely populated urban area; may include several independent administrative districts	largest city of Wisconsin; located in southeastern Wisconsin on the western shore of Lake Michigan; a flourishing agricultural center known for its breweries