Here's what rhymes with zestiest.
                        
                        
                    
                                testiest  Words that almost rhyme with zestiest
heftiest  heaviest  veriest  pettiest  sexiest  airiest  emptiest  hairiest  edgiest  peskiest  sweatiest  variant  wealthiest  deadliest  scariest  lengthiest  sketchiest  cheviot  wariest  fleshiest  smelliest  dressiest  stealthiest  fleshliest  peppiest  tetchiest  leggiest  teariest  chariot  prescient  friendliest  recreant  lariat  homeliest  cerement  cleanliest  stretchiest  preppiest  invariant  comeliest  unfriendliest  uncleanliest  commissariat  secretariat  proletariat