Chittagong vs city

Chittagong and city both are nouns.

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

Chittagong (noun)	city (noun)
a port city and industrial center in southeastern Bangladesh on the Bay of Bengal	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