urban center vs Allentown

urban center and Allentown both are nouns.

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

urban center (noun)	Allentown (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in eastern Pennsylvania; an industrial and commercial center