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