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