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