Christchurch vs urban center

Christchurch and urban center both are nouns.

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

Christchurch (noun)	urban center (noun)
industrial city at the center of a rich agricultural region	a large and densely populated urban area; may include several independent administrative districts