city vs Bologna

city and Bologna both are nouns.

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

city (noun)	Bologna (noun)
people living in a large densely populated municipality	the capital of Emilia-Romagna; located in northern Italy to the east of the Apennines
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter