metropolis vs Antwerp

metropolis and Antwerp both are nouns.

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

metropolis (noun)	Antwerp (noun)
people living in a large densely populated municipality	a busy port and financial center in northern Belgium on the Scheldt river; it has long been a center for the diamond industry and the first stock exchange was opened there in 1460
a large and densely populated urban area; may include several independent administrative districts