metropolis vs Clarksburg

metropolis and Clarksburg both are nouns.

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

metropolis (noun)	Clarksburg (noun)
people living in a large densely populated municipality	a city in northern West Virginia
a large and densely populated urban area; may include several independent administrative districts