metropolis vs Halicarnassus

metropolis and Halicarnassus both are nouns.

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

metropolis (noun)	Halicarnassus (noun)
people living in a large densely populated municipality	an ancient Greek city on the southwestern coast of Asia Minor in what is now Turkey; site of the mausoleum at Halicarnassus
a large and densely populated urban area; may include several independent administrative districts