painkiller
noun
                                                                                                                            
                                                            pain·kill·er
                    
                                                                                                              
                                                                                                                                  ˈpān-ˌki-lər  
                                                      
                                                          
            
            variants  
 or less commonly pain-killer
        
    
                                
              
          
                                                      : something (such as a drug) that relieves pain                                      
                
                    
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  Merriam-Webster unabridged




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