urban center vs Naha City

urban center and Naha City both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Naha City	Yes	No	No	No

urban center (noun)	Naha City (noun)
a large and densely populated urban area; may include several independent administrative districts	the chief city in the Ryukyu Islands