Essen vs urban center

Essen and urban center both are nouns.

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

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