metropolis vs Knoxville

metropolis and Knoxville both are nouns.

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

metropolis (noun)	Knoxville (noun)
people living in a large densely populated municipality	a city in eastern Tennessee on the Tennessee River
a large and densely populated urban area; may include several independent administrative districts