Al-Mukalla vs urban center

Al-Mukalla and urban center both are nouns.

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

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