city vs Thebes

city and Thebes both are nouns.

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

city (noun)	Thebes (noun)
people living in a large densely populated municipality	an ancient Greek city in Boeotia destroyed by Alexander the Great in 336 BC
a large and densely populated urban area; may include several independent administrative districts	an ancient Egyptian city on the Nile River that flourished from the 22nd century BC to the 18th century BC; today the archeological remains include many splendid temples and tombs
an incorporated administrative district established by state charter