fun in WordNet English dictionary

1. activities that are enjoyable or amusing
   "I do it for the fun of it"; "he is fun to have around"
   fun  merriment  playfulness 
   
2. violent and excited activity
   "she asked for money and then the fun began"; "they began to fight like fun"
   fun 
   
3. a disposition to find (or make) causes for amusement
   "her playfulness surprised me"; "he was fun to be with"
   playfulness  fun 
   
4. verbal wit or mockery (often at another's expense but not to be taken seriously)
   "he became a figure of fun"; "he said it in sport"
   fun  play  sport