city vs Chittagong

city and Chittagong both are nouns.

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

city (noun)	Chittagong (noun)
people living in a large densely populated municipality	a port city and industrial center in southeastern Bangladesh on the Bay of Bengal
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter