Is the word British and Norwegian noun?

The word "British" is an adjective, not a noun. It is used to describe something or someone from Great Britain. For example, you could say "The British people are very friendly" or "I love British food." The word "Norwegian" is also an adjective, not a noun. It is used to describe something or someone from Norway. For example, you could say "The Norwegian fjords are beautiful" or "I met a Norwegian man on vacation."