metropolis vs Pompeii

metropolis and Pompeii both are nouns.

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

metropolis (noun)	Pompeii (noun)
people living in a large densely populated municipality	ancient city to the southeast of Naples that was buried by a volcanic eruption from Vesuvius
a large and densely populated urban area; may include several independent administrative districts