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