Pusan vs metropolis

Pusan and metropolis both are nouns.

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

Pusan (noun)	metropolis (noun)
a city in southeastern South Korea on the Korean Strait; the chief port and second largest city	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts