Here's what rhymes with lactarium.
                        
                        
                    
                                barium  aquarium  honorarium  sanitarium  planetarium  vivarium  Words that almost rhyme with lactarium
carrion  clarion  agrarian  ovarian  sectarian  nobelium  librarian  barbarian  libertarian  chameleon  sanitarian  egalitarian  proletarian  antiquarian  vegetarian  trinitarian  octogenarian  nonsectarian  vulgarian  cnidarian  authoritarian  humanitarian  utilitarian  totalitarian  veterinarian  centenarian  seminarian  nonagenarian  communitarian  latitudinarian  disciplinarian  parliamentarian  valetudinarian  sexagenarian  septuagenarian  gentium  biennium  fermium  requiem  lutetium  millennium  compendium  proscenium  technetium  quadrennium  endometrium  lawrencium