Here's what rhymes with propitiatorium.
                        
                        
                    
                                thorium  emporium  terrarium  auditorium  moratorium  sanatorium  crematorium  Words that almost rhyme with propitiatorium
saurian  riparian  praetorian  caesarian  historian  stentorian  valedictorian  salutatorian  hahnium  germanium  pericardium  strontium  myocardium  syllogism  consortium  californium