Nan-chang vs urban center

Nan-chang and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nan-chang	Yes	No	No	No
urban center	Yes	No	No	No

Nan-chang (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