Do you mean the word "fun?" Here is a dictionary definition of the word "fun"
Meanings of "fun" used as a noun
1. amusement, sport, treat, pleasure, entertainment, cheer, good time, recreation, enjoyment, romp, distraction, diversion, frolic, junketing, merriment, whoopee (informal), high jinks, living it up. Example: You still have time to join in the fun.
2. joking, clowning, merriment, playfulness, play, game, sport, nonsense, teasing, jesting, skylarking (informal) Example: There was lots of fun going on last night.
3. enjoyment, pleasure, joy, cheer, mirth, gaiety. Example: She had a great sense of fun.
Example: I thought he was a figure of fun.
Meaning of "fun"used as an adjective:
enjoyable, entertaining, pleasant, amusing, lively, diverting, witty, convivial. Example: It was a fun evening.
for or in fun for a joke, tongue in cheek, jokingly, playfully, for a laugh, mischievously, in jest, teasingly. Example: Don't say such things, even in fun.
fun and games horseplay, clowning, romping, pranks, fooling around, rough-and-tumble, junketing, revelry, skylarking (informal), high jinks, jollity, buffoonery, merrymaking. Example: Their fun and games hurt a lot of people.
make fun of something or someone mock, tease, ridicule, poke fun at, take off, rag, rib (informal), laugh at, taunt, mimic, parody, deride, send up (Brit. informal), scoff at, sneer at, lampoon, make a fool of, pour scorn on, take the mickey out of (Brit. informal), satirize, pull someone's leg, hold up to ridicule, make a monkey of, make sport of, make the butt of, make game of. Example: Don't make fun of me!