Izmir vs metropolis

Izmir and metropolis both are nouns.

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

Izmir (noun)	metropolis (noun)
a port city in western Turkey	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts