Hannover vs urban center

Hannover and urban center both are nouns.

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

Hannover (noun)	urban center (noun)
a port city in northwestern Germany; formerly a member of the Hanseatic League	a large and densely populated urban area; may include several independent administrative districts