urban center vs Aix-la-Chapelle

urban center and Aix-la-Chapelle both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Aix-la-Chapelle	Yes	No	No	No

urban center (noun)	Aix-la-Chapelle (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in western Germany near the Dutch and Belgian borders; formerly it was Charlemagne's northern capital