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