metropolis vs Herculaneum

metropolis and Herculaneum both are nouns.

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

metropolis (noun)	Herculaneum (noun)
people living in a large densely populated municipality	ancient city; now destroyed
a large and densely populated urban area; may include several independent administrative districts