urban center vs Tangier

urban center and Tangier both are nouns.

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

urban center (noun)	Tangier (noun)
a large and densely populated urban area; may include several independent administrative districts	a city of northern Morocco at the west end of the Strait of Gibraltar