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