city vs Lanzhou

city and Lanzhou both are nouns.

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

city (noun)	Lanzhou (noun)
people living in a large densely populated municipality	the capital city of the Chinese province of Gansu on the Yellow River
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter