Here's what rhymes with unpossession.
                        
                        
                    
                                possession  session  cession  profession  accession  procession  obsession  intercession  aggression  succession  concession  confession  oppression  recession  secession  depression  impression  compression  discretion  progression  regression  suppression  digression  dispossession  expression  repression  transgression  indiscretion  decompression  retrogression  Words that almost rhyme with unpossession
seven  heaven  lesson  lessen  resin  leaven  eleven  section  perception  affection  perfection  ascension  felon  heron  attention  direction  mention  tension  weapon  intersection  pension  threaten  deception  dissection  lemon  reckon  defection  dissension  freshman  imperfection  headman  leaden  melon  headmen  interception  collection  connection  election  protection  conception  exception  infection  intervention  reflection  selection  chairman  convention  correction  detection  dimension  invention  objection  prevention  reception  connexion  projection  suspension  deflection  detention  erection  inception  resection  tendon  convection  ejection  condescension  dejection  dentin  disaffection  distension  lengthen  pepsin  declension  henchmen  indirection  pectin  reflexion  sexton  question  extension  injection  inspection  rejection  apprehension  brethren  contention  hypertension  resurrection  retention  strengthen  complexion  digestion  exemption  insurrection  subjection  contraception  inflection  introspection  distention  pretension  abstention  preemption  redirection  watermelon  intention  suggestion  rebellion  comprehension  intestine  recollection  redemption  congestion  ingestion  misconception  predilection  contravention  disinfection  inattention  indigestion  interconnection  reelection  disconnection  misapprehension  circumspection