Casper vs metropolis

Casper and metropolis both are nouns.

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

Casper (noun)	metropolis (noun)
a city of east central Wyoming on the North Platte river	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts