Nanchang vs urban center

Nanchang and urban center both are nouns.

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

Nanchang (noun)	urban center (noun)
a walled city in southeastern China on the Gan Jiang	a large and densely populated urban area; may include several independent administrative districts