urban center vs Abidjan

urban center and Abidjan both are nouns.

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

urban center (noun)	Abidjan (noun)
a large and densely populated urban area; may include several independent administrative districts	city recognized by the United States as the capital of the Ivory Coast; largest city of the Ivory Coast