Chittagong vs metropolis

Chittagong and metropolis both are nouns.

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

Chittagong (noun)	metropolis (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