1. 
   Duper
   Dup'er noun One who dupes another.
   Found op http://www.encyclo.co.uk/webster/D/132
   
   
2. 
   Duper
   • (n.) One who dupes another.
   Found op http://thinkexist.com/dictionary/meaning/duper/
   
   
3. 
   duper
   1) Con artist 2) Super conclusion?
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/duper/1
   
   

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