Cotonou vs urban center

Cotonou and urban center both are nouns.

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

Cotonou (noun)	urban center (noun)
chief port of Benin on the Bight of Benin	a large and densely populated urban area; may include several independent administrative districts