Here's what rhymes with catalysts.
                        
                        
                    
                                philatelists  Words that almost rhyme with catalysts
analysts  annalists  activists  catapults  animists  animates  battlements  alchemists  amulets  applets  annulments  assonants  accidents  advocates  cabinets  annulus  cancellous  cannabis  laminates  psychoanalysts  salicylates  assonance  cantonments  adjutants  chaplets  abrogates  coagulants  acclimates  graduates  antagonists  calculus  abstinence  ambulance  fabulous  sacraments  scandalous  thalamus  callousness  ravenous  abacus  encapsulates  romanticists  gravitas  semanticists  flagellants  laminas  anatomised  clamminess  anatomise  analysis  analogous  paralysis  capacitance  dialysis  miraculous  contaminants  protagonists  gelatinous  calamitous  fatuous  gangrenous  maximus  randomised  bashfulness  flatulence  maximised  parabolas  madrasas  cohabitants  maleficence  tactfulness  captiousness  randomise  tacitness  validness  fallibleness  inhabitants  unanimous  blasphemous  magnanimous  randomness  thankfulness  entanglements  handedness  anxiousness  handsomeness  tactlessness  classlessness  metabolise  televangelists  haplessness  rapidness  vapidness  tangibleness  extravagance  anticoagulants  recalcitrance  oleaginous  ambassadress  fractiousness  intransigents  thanklessness  psychoanalysis  undergraduates  intransigence  postgraduates  highhandedness  offhandedness  taskmistress  hemodialysis  pusillanimous  openhandedness  underhandedness