Wilmington vs urban center

Wilmington and urban center both are nouns.

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

Wilmington (noun)	urban center (noun)
the largest city in Delaware	a large and densely populated urban area; may include several independent administrative districts
a town in southeastern North Carolina on the Cape Fear River