Norfolk vs urban center

Norfolk and urban center both are nouns.

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

Norfolk (noun)	urban center (noun)
port city located in southeastern Virginia on the Elizabeth River at the mouth of Chesapeake Bay; headquarters of the Atlantic fleet of the United States Navy	a large and densely populated urban area; may include several independent administrative districts