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