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