Timbuktu vs metropolis

Timbuktu and metropolis both are nouns.

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

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