Korean
The proper noun Korea (a region, two countries) has the proper adjective Korean (adjective and demonym).
korean
Norway is a proper noun, not an adjective. It is the name of a country. It does not change.
Yes, it can be, used as the proper adjective for the proper noun Korea (Korean peninsula, Korean food). Korean is also a noun, for the language or as a demonym for a person from Korea.
The proper adjective for Antarctica is Antarctic, as in Antarctic Circle.
Afghan
When a proper noun is used as and adjective, it is a proper adjective; for example:Ancient Mexican structures have similarities to ancient Egyptian structures.
To change "France" from a proper adjective to a proper noun, you can refer to France as a specific place, country, or entity instead of using it to describe something. For example, instead of saying "French culture," you can say "France's culture," making "France" the proper noun.
The proper adjectives are:KoreanPolishAlaskanBelgianSwedishFrenchRussianCubanPeruvianIndian
England - and + ish = English.
Irish
English