metropolis vs Charleroi

metropolis and Charleroi both are nouns.

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

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