Here's what rhymes with fiducial.
                        
                        
                    
                                crucial  Words that almost rhyme with fiducial
perusal  rueful  removal  approval  occlusal  bamboozle  refusal  disapproval  protrusile  dual  duel  jewel  tubal  ducal  poodle  doodle  duple  boodle  tootle  pupil  brutal  buccal  bugle  butyl  dural  ruble  noodle  pupal  rouble  tuneful  google  newel  bluegill  bejewel  fuel  cruel  neutral  feudal  renewal  futile  scruple  frugal  cupful  nubile  strudel  caboodle  crewel  spoonbill  useful  fruitful  youthful  truthful  accrual  spoonsful  synfuel  scoopful  canoodle  communal  tribunal  quadruple  refuel  monsoonal  instinctual  unfruitful  untruthful  dessertspoonful  tablespoonful  dessertspoonsful  premenstrual  tablespoonsful