urban center vs Aqaba

urban center and Aqaba both are nouns.

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

urban center (noun)	Aqaba (noun)
a large and densely populated urban area; may include several independent administrative districts	Jordan's port; located in southwestern Jordan on the Gulf of Aqaba