Philippopolis vs metropolis

Philippopolis and metropolis both are nouns.

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

Philippopolis (noun)	metropolis (noun)
an ancient city in southern Bulgaria; commercial center of an agricultural region	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts