Naha City vs urban center

Naha City and urban center both are nouns.

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

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