Here's what rhymes with deathnium.
                        
                        
                    
                                Words that almost rhyme with deathnium
barium  gentium  biennium  requiem  millennium  proscenium  lutetium  fermium  nobelium  aquarium  compendium  honorarium  technetium  quadrennium  vivarium  lawrencium  endometrium  sanitarium  planetarium