Port Sudan vs metropolis

Port Sudan and metropolis both are nouns.

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

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