Here's what rhymes with rerum.
                        
                        
                    
                                eorum  Words that almost rhyme with rerum
elan  enim  iam  freedom  diesem  cerium  threesome  teatime  chiefdom  labium  cilium  fiefdom  sheikdom  sheikhdom  museum  hominum  arboretum  samarium  solarium  mausoleum  imperium  capsicum  coliseum  francium  encomium  trapezium  protactinium