urban center vs Norfolk

urban center and Norfolk both are nouns.

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

urban center (noun)	Norfolk (noun)
a large and densely populated urban area; may include several independent administrative districts	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