sermonize
verb
                                                                                                                            
                                                            ser·mon·ize
                    
                                                                                                              
                                                                                                                                  ˈsər-mə-ˌnīz 
                                                      
                                                          
            
            
              sermonized; sermonizing            
        
    
                                
              
          
                                                      : to preach to or on at length                                      
                
                    
                                                      sermonizer
                                      noun
                                                                            
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  Merriam-Webster unabridged




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