Another word for fun
play, game, sport, jest, amusement, relaxation, pastime, diversion, frolic, mirth, entertainment, recreation, solace, merriment, jollity, jollification, pleasure, good time, drollery, buffoonery, foolery, fooling, romping, joke, absurdity, playfulness, laughter, frolicsomeness, festivity, carnival, tomfoolery, escapade, antic, romp, gambol, prank, lark, comedy, banter, teasing, raillery, high jinks, celebration, holiday, rejoicing, good humor, joking, jocularity, enjoyment, gladness, good cheer, delight, glee, high glee, treat, hilarity, blitheness, joy, jocundity, joviality, time of one's life*, blast*, whoopee*, picnic*, riot*.
for amusement, not seriously, playfully, for no reason, for the fun of it, as a joke, for laughs, for kicks*; see also happily 2.
Another word for funnoun
Joyful, exuberant activity:conviviality, festival, festiveness, festivity, gaiety, jollity, merriment, merrymaking, revel (often used in plural), revelry. See laughter
Activity engaged in for relaxation and amusement:disport, diversion, play, recreation, sport. See work
Actions taken as a joke:game, play, sport. See work