metropolis vs Aden

metropolis and Aden both are nouns.

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

metropolis (noun)	Aden (noun)
people living in a large densely populated municipality	an important port of Yemen; located on the Gulf of Aden; its strategic location has made it a major trading center of southern Arabia since ancient times
a large and densely populated urban area; may include several independent administrative districts