Pergamum vs city

Pergamum and city both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pergamum	Yes	No	No	No
city	Yes	No	No	No

Pergamum (noun)	city (noun)
an ancient Greek city located in the western part of what is now modern Turkey; the technique of preparing sheepskins as parchment was developed here	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts
	an incorporated administrative district established by state charter