Guangzhou vs urban center

Guangzhou and urban center both are nouns.

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

Guangzhou (noun)	urban center (noun)
a city on the Zhu Jiang delta in southern China; the capital of Guangdong province and a major deep-water port	a large and densely populated urban area; may include several independent administrative districts