city vs Shanghai

city and Shanghai both are nouns.

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

city (noun)	Shanghai (noun)
people living in a large densely populated municipality	the largest city of China; located in the east on the Pacific; one of the largest ports in the world
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter