urban center vs Aarhus

urban center and Aarhus both are nouns.

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

urban center (noun)	Aarhus (noun)
a large and densely populated urban area; may include several independent administrative districts	port city of Denmark in eastern Jutland