Here's what rhymes with praeficiendum.
                        
                        
                    
                                referendum  Words that almost rhyme with praeficiendum
tendon  dentin  hempen  intention  momentum  distention  subvention  indention  intervention  inattention  abstention  supervention  circumvention  contravention  nonintervention  seldom  venom  phenom  harem  denim  vellum  velum  envenom  welcome  septum  addendum  plenum  bedlam  jetsam  webcam  spectrum  rectum  cerebellum  unwelcome  flagellum  plectrum  antebellum  antiserum  interregnum  bubblegum