city vs Luluabourg

city and Luluabourg both are nouns.

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

city (noun)	Luluabourg (noun)
people living in a large densely populated municipality	a city in southwestern Congo; former name (until 1966) was Luluabourg
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter