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