metropolis vs Liepaja

metropolis and Liepaja both are nouns.

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

metropolis (noun)	Liepaja (noun)
people living in a large densely populated municipality	a city of southwestern Latvia on the Baltic Sea
a large and densely populated urban area; may include several independent administrative districts