urban center vs Huambo

urban center and Huambo both are nouns.

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

urban center (noun)	Huambo (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in the mountains in western Angola