urban center vs Zomba

urban center and Zomba both are nouns.

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

urban center (noun)	Zomba (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southern Malawi; was the capital until 1971