Same word as prankster:

atrocity, catastrophe, devil, devilment, devilry, dirty trick, evil, fault, friskiness, frolicsomeness, funny business, gag, harm, high jinks, hurt, ill, imp, impishness, injury, misbehavior, mischievousness, misconduct, misdoing, misfortune, monkey business, naughtiness, outrage, playfulness, prank, rascal, rascality, rogue, roguery, roguishness, sabotage, scamp, shenanigans, sportiveness, transgression, vandalism, waggery, waggishness, waywardness, wrong, wrongdoing