Charleroi vs metropolis

Charleroi and metropolis both are nouns.

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

Charleroi (noun)	metropolis (noun)
city in southwestern Belgium; center of an industrial region	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts