urban center vs Lubumbashi

urban center and Lubumbashi both are nouns.

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

urban center (noun)	Lubumbashi (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southeastern Congo near the border with Zambia; a copper mining center; former name (until 1966) was Elisabethville