city vs Dubrovnik

city and Dubrovnik both are nouns.

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

city (noun)	Dubrovnik (noun)
people living in a large densely populated municipality	a port city in southwestern Croatia on the Adriatic; a popular tourist center
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter