Here's what rhymes with opearation.
                        
                        
                    
                                generation  nation  decoration  iteration  aeration  elation  education  operation  duration  preparation  separation  station  admiration  declaration  elevation  innovation  liberation  alteration  delegation  dissertation  imitation  irrigation  dedication  derivation  desolation  desperation  dilatation  federation  negation  toleration  veneration  aberration  adoration  bifurcation  divination  donation  inhalation  innervation  oration  perforation  reparation  sedation  summation  ablation  defamation  deflation  detonation  dictation  information  relation  situation  application  creation  cooperation  corporation  location  observation  variation  deviation  immigration  indication  inflation  inspiration  isolation  motivation  obligation  preservation  restoration  revelation  rotation  salvation  taxation  violation  agitation  allocation  aspiration  degeneration  degradation  designation  destination  domination  estimation  fixation  hesitation  irritation  medication  meditation  notation  penetration  plantation  regeneration  reservation  respiration  saturation  temptation  termination  vacation  vegetation  affirmation  animation  approbation  authorization  aviation  causation  cessation  deliberation  deprivation  dissipation  distillation  elaboration  emigration  evaporation  expiration  insulation  litigation  maturation  moderation  narration  ordination  oscillation  probation  reformation  vocation  allegation  alternation  appellation  automation  citation  damnation  deputation  devastation  emulation  enumeration  escalation  germination  gestation  intimation  intonation  invocation  ovulation  perspiration  perturbation  recitation  renovation  revocation  ulceration  visitation  population  formation  association  determination  foundation  imagination  integration  legislation  occupation  presentation  publication  radiation  regulation  reputation  translation  activation  adaptation  correlation  cultivation  exploration  illustration  invitation  limitation  migration  realization  sensation  stimulation  acceleration  alienation  anticipation  arbitration  assimilation  celebration  deterioration  elimination  excitation  illumination  implication  inclination  indignation  inflammation  initiation  installation  navigation  nomination  oxidation  proliferation  propagation  quotation  recreation  resignation  segregation  simulation  speculation  valuation  ventilation  vibration  accusation  affiliation  aggregation  annihilation  attenuation  denomination  dislocation  dissemination  dissociation  exaggeration  excavation  fabrication  fascination  filtration  habitation  ionization  irradiation  mediation  mobilization  modulation  mutation  notification  polarization  realisation  replication  starvation  validation  adjudication  amputation  capitulation  castration  connotation  coronation  delineation  demarcation  dispensation  elucidation  eradication  fibrillation  hydration  imputation  inauguration  interpolation  interrogation  provocation  reclamation  sanitation  stagnation  stipulation  subjugation  urbanization  usurpation  vindication  organization  combination  consideration  examination  explanation  circulation  civilization  conversation  evaluation  participation  appreciation  conservation  demonstration  differentiation  formulation  modification  organisation  orientation  accommodation  appropriation  collaboration  computation  confirmation  coordination  deformation  depreciation  emancipation  frustration  incorporation  negotiation  proclamation  registration  relaxation  utilization  annexation  articulation  assassination  calibration  certification  civilisation  coagulation  compilation  complication  consolation  evacuation  fermentation  generalization  globalization  graduation  importation  incarnation  incubation  localization  modernization  optimization  ratification  remuneration  retaliation  retardation  socialization  specialization  verification  abbreviation  affectation  authentication  cancellation  commendation  confederation  conformation  consummation  culmination  dehydration  denunciation  deportation  deregulation  devaluation  duplication  elongation  exaltation  exclamation  exhortation  fertilization  gravitation  immunization  implantation  inactivation  inoculation  intimidation  liquidation  masturbation  mortification  polymerization  prolongation  punctuation  refrigeration  refutation  regurgitation  relocation  segmentation  sterilization  utilisation  vaccination  interpretation  identification  investigation  transformation  calculation  compensation  configuration  discrimination  expectation  exploitation  justification  transportation  approximation  condemnation  congregation  consultation  contamination  continuation  manipulation  precipitation  recommendation  rehabilitation  specification  amplification  clarification  colonization  condensation  disintegration  gratification  humiliation  infiltration  intoxication  preoccupation  privatization  purification  signification  sophistication  stabilization  subordination  unification  amalgamation  augmentation  capitalization  categorization  conciliation  confiscation  consecration  constellation  consternation  constipation  exportation  extermination  fluctuation  hybridization  menstruation  normalization  ornamentation  quantification  renunciation  repudiation  resuscitation  sedimentation  visualization  administration  communication  concentration  classification  representation  accumulation  implementation  characterization  confrontation  consolidation  contemplation  documentation  manifestation  qualification  reconciliation  fragmentation  liberalization  multiplication  pronunciation  stratification  calcification  centralization  conflagration  crystallization  democratization  diversification  hospitalization  intensification  magnetization  magnification  personification  simplification  standardization  supplementation  synchronization  experimentation  reorganization  transplantation  argumentation  decentralization  instrumentation  nationalization  rationalization  excommunication  industrialization  conceptualization  misrepresentation  Words that almost rhyme with opearation
occasion  haven  basin  hasten  evasion  equation  invasion  persuasion  taken  pagan  shaken  awaken  bacon  laden  maiden  layman  laymen  shaman  patron  mistaken  salesman  contagion  overtaken  straighten  undertaken  statesman  forsaken  tradesmen