urban center vs Hangzhou

urban center and Hangzhou both are nouns.

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

urban center (noun)	Hangzhou (noun)
a large and densely populated urban area; may include several independent administrative districts	a city of eastern China on Hangzhou Bay; regarded by Marco Polo as the finest city in the world