Mombasa vs urban center

Mombasa and urban center both are nouns.

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

Mombasa (noun)	urban center (noun)
a port city in southern Kenya on a coral island in a bay of the Indian Ocean	a large and densely populated urban area; may include several independent administrative districts