Here's what rhymes with comparativism.
                        
                        
                    
                                relativism  schism  eroticism  criticism  prism  activism  positivism  pacifism  aphorism  fetishism  holism  lyricism  parasitism  recidivism  negativism  witticism  chrism  sophism  heroism  mysticism  terrorism  cynicism  dualism  empiricism  parallelism  pessimism  scepticism  classicism  egoism  militarism  elitism  stoicism  albinism  archaism  exoticism  solipsism  purism  solecism  tropism  socialism  despotism  feminism  journalism  liberalism  optimism  skepticism  altruism  barbarism  dynamism  embolism  fanaticism  feudalism  modernism  radicalism  rheumatism  catechism  collectivism  egotism  fatalism  narcissism  nihilism  paganism  agnosticism  anarchism  animism  behaviorism  chauvinism  euphemism  exorcism  heathenism  hedonism  legalism  mannerism  nepotism  ostracism  pauperism  plagiarism  revisionism  shamanism  botulism  cretinism  exhibitionism  isomerism  mesmerism  puritanism  racialism  synergism  anabolism  futurism  philistinism  specialism  tokenism  mechanism  capitalism  metabolism  organism  imperialism  alcoholism  antagonism  materialism  pluralism  symbolism  determinism  federalism  formalism  humanism  naturalism  rationalism  romanticism  unionism  anachronism  cannibalism  dogmatism  evangelism  paternalism  protectionism  regionalism  secularism  separatism  aneurism  astigmatism  commercialism  eclecticism  favoritism  hypnotism  intellectualism  monasticism  populism  traditionalism  voluntarism  abolitionism  automatism  clericalism  ecumenism  favouritism  neutralism  revivalism  adventurism  bimetallism  charlatanism  dilettantism  communism  nationalism  patriotism  conservatism  magnetism  pragmatism  absolutism  consumerism  republicanism  antisemitism  centralism  corporatism  cosmopolitanism  emotionalism  isolationism  mercantilism  provincialism  scholasticism  evangelicalism  gradualism  impressionism  parochialism  perfectionism  proselytism  sectionalism  syndicalism  colonialism  individualism  professionalism  bilingualism  fundamentalism  hyperthyroidism  hypothyroidism  postmodernism  utilitarianism  expansionism  factionalism  functionalism  sectarianism  expressionism  interventionism  authoritarianism  industrialism  internationalism  totalitarianism  egalitarianism  existentialism  microorganism  sensationalism  sentimentalism  anticommunism  constitutionalism  environmentalism  somnambulism  transcendentalism  humanitarianism  electromagnetism  Words that almost rhyme with comparativism
decision  division  vision  rhythm  arisen  risen  fission  mizzen  given  position  listen  mission  prison  emission  incision  excision  apposition  envision  riven  stiffen  prevision  rescission  addition  opposition  driven  edition  permission  physician  provision  television  admission  petition  precision  revision  forgiven  ignition  omission  subdivision  supposition  tuition  attrition  derision  fruition  sedition  technician  volition  dentition  imprison  indecision  paroxysm  striven  audition  glisten  definition  tradition  commission  transition  algorithm  ambition  disposition  proposition  repetition  supervision  suspicion  abolition  collision  deposition  exposition  inhibition  intuition  partition  submission  clinician  imposition  musician  remission  apparition  erudition  magician  preposition  interposition  logarithm  patrician  rendition  disquisition  logician  rhetorician  dietitian  ebullition  readmission  tactician  condition  composition  transmission  acquisition  expedition  coalition  cognition  decomposition  exhibition  nutrition  politician  prohibition  superstition  admonition  demolition  requisition  transposition  contrition  inquisition  intermission  presupposition  redefinition  superposition  cataclysm  premonition  theoretician  academician  imprecision  munition  competition  recognition  ammunition  circumcision  juxtaposition  predisposition  extradition  indisposition  electrician  manumission  obstetrician  pediatrician  statistician  malnutrition  mathematician  precondition  superimposition  diagnostician  serum  theorem  cecum  system  wisdom  victim  fearsome  gingham  kingdom  symptom  dictum  gypsum  winsome  pilgrim  ecosystem