metropolis vs Durban

metropolis and Durban both are nouns.

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

metropolis (noun)	Durban (noun)
people living in a large densely populated municipality	a port city in eastern South Africa on the Indian Ocean; resort and industrial center
a large and densely populated urban area; may include several independent administrative districts