Guangzhou vs city

Guangzhou and city both are nouns.

Word	Noun	Adjective	Verb	Adverb
Guangzhou	Yes	No	No	No
city	Yes	No	No	No

Guangzhou (noun)	city (noun)
a city on the Zhu Jiang delta in southern China; the capital of Guangdong province and a major deep-water port	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts
	an incorporated administrative district established by state charter