Mwanza vs urban center

Mwanza and urban center both are nouns.

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

Mwanza (noun)	urban center (noun)
a city in northern Tanzania on Lake Victoria	a large and densely populated urban area; may include several independent administrative districts