metropolis vs Mombasa

metropolis and Mombasa both are nouns.

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

metropolis (noun)	Mombasa (noun)
people living in a large densely populated municipality	a port city in southern Kenya on a coral island in a bay of the Indian Ocean
a large and densely populated urban area; may include several independent administrative districts