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