city vs Chongqing

city and Chongqing both are nouns.

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

city (noun)	Chongqing (noun)
people living in a large densely populated municipality	a city in south-central China on the Chang Jiang; a commercial center for western China
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter