metropolis vs Louisville

metropolis and Louisville both are nouns.

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

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