city vs Timbuktu

city and Timbuktu both are nouns.

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

city (noun)	Timbuktu (noun)
people living in a large densely populated municipality	a city in central Mali near the Niger river; formerly famous for its gold trade
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter