cosmopolis

As a noun cosmopolis

is an important city, such as a capital city, inhabited by people from a diverse range of cultural backgrounds.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between metropolitan and cosmopolis

is that metropolitan is (christianity) a bishop empowered to oversee other bishops; an archbishop while cosmopolis is an important city, such as a capital city, inhabited by people from a diverse range of cultural backgrounds.

As an adjective metropolitan

is (christianity) pertaining to the see or province of a metropolitan.

As nouns the difference between utopian and cosmopolis

is that utopian is someone who supports or heralds the establishment of a utopia while cosmopolis is an important city, such as a capital city, inhabited by people from a diverse range of cultural backgrounds.

As an adjective utopian

is ideal but often impractical; visionary.

As a proper noun ecumenopolis

is the global conurbation predicted and advocated by.

As a noun cosmopolis is

an important city, such as a capital city, inhabited by people from a diverse range of cultural backgrounds.

As nouns the difference between cosmopoleis and cosmopolis

is that cosmopoleis is (rare) while cosmopolis is an important city, such as a capital city, inhabited by people from a diverse range of cultural backgrounds.

As nouns the difference between taxonomy and cosmopolis

is that taxonomy is the science or the technique used to make a classification while cosmopolis is an important city, such as a capital city, inhabited by people from a diverse range of cultural backgrounds.

As nouns the difference between metropolis and cosmopolis

is that metropolis is the mother (founding) polis (city state) of a colony, especially in the Ancient Greek/Hellenistic world while cosmopolis is an important city, such as a capital city, inhabited by people from a diverse range of cultural backgrounds.