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