urban center vs Shanghai

urban center and Shanghai both are nouns.

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

urban center (noun)	Shanghai (noun)
a large and densely populated urban area; may include several independent administrative districts	the largest city of China; located in the east on the Pacific; one of the largest ports in the world