city vs Guangzhou

city and Guangzhou both are nouns.

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

city (noun)	Guangzhou (noun)
people living in a large densely populated municipality	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
an incorporated administrative district established by state charter