Kingston-upon Hull vs urban center

Kingston-upon Hull and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kingston-upon Hull	Yes	No	No	No
urban center	Yes	No	No	No

Kingston-upon Hull (noun)	urban center (noun)
a large fishing port in northeastern England	a large and densely populated urban area; may include several independent administrative districts