swearer
  宣誓者,咒罵者
  Swear·er n.
  1. One who swears; one who calls God to witness for the truth of his declaration.
  2. A profane person; one who uses profane language.
     Then the liars and swearers are fools.   --Shak.
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  swearer
       n 1: someone who uses profanity
       2: someone who takes a solemn oath