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