Source : Webster's Revised Unabridged Dictionary (1913)

Faller \Fall"er\, n.
   1. One who, or that which, falls.

   2. (Mach.) A part which acts by falling, as a stamp in a
      fulling mill, or the device in a spinning machine to
      arrest motion when a thread breaks.

Source : WordNet®

faller
     n 1: a person who fells trees [syn: {lumberman}, {lumberjack}, {feller}]
     2: a person who falls; "one of them was safe but they were
        unable to save the faller"; "a faller among thieves"