metropolis vs Cologne

metropolis and Cologne both are nouns.

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

metropolis (noun)	Cologne (noun)
people living in a large densely populated municipality	a commercial center and river port in western Germany on the Rhine River; flourished during the 15th century as a member of the Hanseatic League
a large and densely populated urban area; may include several independent administrative districts