Greenville vs metropolis

Greenville and metropolis both are nouns.

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

Greenville (noun)	metropolis (noun)
a town in northwest South Carolina in the Piedmont	people living in a large densely populated municipality
a town in western Mississippi on the Mississippi River to the north of Vicksburg	a large and densely populated urban area; may include several independent administrative districts
a city in eastern North Carolina; tobacco market