Susa vs metropolis

Susa and metropolis both are nouns.

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

Susa (noun)	metropolis (noun)
a port city in eastern Tunisia on the Mediterranean	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts