Braunschweig vs urban center

Braunschweig and urban center both are nouns.

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

Braunschweig (noun)	urban center (noun)
a city in central Germany	a large and densely populated urban area; may include several independent administrative districts