Fun and Joyousness

Fun noun - Someone or something that provides amusement or enjoyment.

Joyousness and fun are semantically related In some cases you can use "Joyousness" instead a noun "Fun".

Joyousness noun - The emotion of great happiness.

Fun and joyousness are semantically related in happiness topic. Sometimes you can use "Fun" instead a noun "Joyousness", if it concerns topics such as gaiety, extreme happiness, great joy.