metropolis vs Esfahan

metropolis and Esfahan both are nouns.

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

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