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