ex·e·cu·tion·er /-ʃ(ə)nɝ/
  死刑執行人,劊子手
  Ex·e·cu·tion·er n.
  1. One who executes; an executer.
  2. One who puts to death in conformity to legal warrant, as a hangman.
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  executioner
       n : an official who inflicts capital punishment in pursuit of a
           warrant [syn: public executioner]
  Executioner
     (Mark 6:27). Instead of the Greek word, Mark here uses a Latin
     word, speculator, which literally means "a scout," "a spy," and
     at length came to denote one of the armed bodyguard of the
     emperor. Herod Antipas, in imitation of the emperor, had in
     attendance on him a company of speculatores. They were sometimes
     employed as executioners, but this was a mere accident of their
     office. (See MARK, GOSPEL OF.)