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Synonyms for Butcher (same or very similar meaning)

WordNet sense 1 (a retailer of meat):

WordNet sense 2 (a person who slaughters or dresses meat for market):

WordNet sense 3 (someone who makes mistakes because of incompetence):
blunderer, botcher, bumbler, bungler, fumbler, stumbler, fuckup, sad sack

WordNet sense 4 (kill (animals) usually for food consumption):

From the ODE community, based on WordNetadd/edit