city vs Kwangju

city and Kwangju both are nouns.

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

city (noun)	Kwangju (noun)
people living in a large densely populated municipality	city in southwestern South Korea; an important military base during the Korean War
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter