urban center vs Solingen

urban center and Solingen both are nouns.

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

urban center (noun)	Solingen (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in west central Germany noted for cutlery