buffoonery, clownery, clowning, foolery, high jinks(also hijinks), horseplay, horsing around, monkeying, monkeyshine(s), roughhouse, roughhousing, shenanigan(s), skylarking, slapstick, tomfoolery

childishness, clownishness, foolishness, funning, jesting, joking, nonsense, silliness, waggeryboisterousness, rambunctiousness, rowdiness, rowdyism, rumbustiousness(chiefly British)devilry(or deviltry), impishness, knavery, mischief, mischievousness, prankishness, rascality, roguery, roguishness, trickerycavorting, frivolity, frolicking, gamboling(or gambolling), merrymaking, playfulness, revelry, roistering, romping, sporting, sportiveness