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