Louisville vs metropolis

Louisville and metropolis both are nouns.

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

Louisville (noun)	metropolis (noun)
the largest city in Kentucky; located in north central Kentucky on the Ohio river; site of the Kentucky Derby	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts