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