Source : Webster's Revised Unabridged Dictionary (1913)

Hangman \Hang"man\, n.; pl. {Hangmen}(?).
   One who hangs another; esp., one who makes a business of
   hanging; a public executioner; -- sometimes used as a term of
   reproach, without reference to office. --Shak.

Source : WordNet®

hangman
     n : an executioner who hangs the condemned person