metropolis vs Port Sudan

metropolis and Port Sudan both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Port Sudan	Yes	No	No	No

metropolis (noun)	Port Sudan (noun)
people living in a large densely populated municipality	port city in Sudan on the Red Sea
a large and densely populated urban area; may include several independent administrative districts