Mukalla vs urban center

Mukalla and urban center both are nouns.

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

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