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