urban center vs Essen

urban center and Essen both are nouns.

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

urban center (noun)	Essen (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in western Germany; industrial center of the Ruhr