urban center vs Linz

urban center and Linz both are nouns.

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

urban center (noun)	Linz (noun)
a large and densely populated urban area; may include several independent administrative districts	city in northern Austria on the Danube; noted as a cultural center