Here's what rhymes with proposicidn.
                        
                        
                    
                                widen  beiden  Words that almost rhyme with proposicidn
heighten  frighten  tighten  lighten  ripen  whiten  titan  brighten  enlighten  pallidum  siren  hyphen  scion  siphon  hymen  syphon  horizon  lion  fibrin  bison  fireman  firemen  lichen  liken  liven  thriven  baryon  prion  lineman  linemen  pinyon  finespun  veniremen  bedizen  billycan  funnyman  enliven  perihelion  aphelion  cotyledon  linesman  dicotyledon  dandelion  monocotyledon