metropolis vs Aleppo

metropolis and Aleppo both are nouns.

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

metropolis (noun)	Aleppo (noun)
people living in a large densely populated municipality	a city in northwestern Syria
a large and densely populated urban area; may include several independent administrative districts