What is another word for "doer"?

Roget's Thesaurus (1911) lists these synonyms for "doer": accident, adulator, adversity, and, awry, bad, badness, bale, bane, blow, box, bruise, buffet, calamity, casualty, catastrophe, cause, claqueur, clawback, cost, courtier, crying, damage, demon, destruction, deterioration, devil, dirty, disadvantage, disadvantageous, disaster, disastrous, disservice, drawback, earwig, encomiast, eulogist, evil, field, flaneur.