urban center vs Al Mukalla

urban center and Al Mukalla both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Al Mukalla	Yes	No	No	No

urban center (noun)	Al Mukalla (noun)
a large and densely populated urban area; may include several independent administrative districts	a port in southern Yemen on the Gulf of Aden to the east of Aden