Here's what rhymes with superfast.
                        
                        
                    
                                fast  vast  hast  last  passed  past  cast  caste  mast  harassed  aghast  amassed  massed  blast  classed  surpassed  overcast  recast  repast  unsurpassed  enthusiast  Words that almost rhyme with superfast
shaft  laughed  dashed  flashed  lashed  raft  smashed  staffed  gasp  mashed  slashed  craft  draft  grasp  graft  draught  clasp  crashed  clashed  splashed  photographed  telegraphed  handicraft  mimeographed  that  fact  sat  fat  hat  shalt  hatched  thatched  hacked  sacked  vat  advanced  attached  attacked  flat  cat  packed  rat  adapt  backed  lacked  matched  wrapped  bat  chat  danced  mapped  mat  pact  snapped  snatched  tact  tapped  taxed  thanked  cant  capped  chanced  chant  gasped  masked  pat  scant  slant  slapped  spat  stacked  waxed  canst  lapsed  patched  racked  rapt  smacked  stat  tacked  tat  plant  exact  grant  attract  enhanced  tract  collapsed  detached  glanced  grasped  react  trapped  cracked  despatched  dispatched  elapsed  financed  habitat  ranked  stamped  artifact  camped  clapped  clasped  enact  flanked  scratched  tracked  banked  damped  strapped  transact  yanked  impact  abstract  intact  interact  relaxed  branched  clamped  cramped  distract  subtract  caveat  detract  overlapped  relapsed  supplant  thermostat  extract  counteract  handicapped  transplant  diplomat  encamped  implant  democrat  retract  aristocrat