Esfahan vs metropolis

Esfahan and metropolis both are nouns.

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

Esfahan (noun)	metropolis (noun)
city in central Iran; former capital of Persia	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts