Here's what rhymes with unionjack.
                        
                        
                    
                                back  pack  jack  tack  tak  unpack  black  attack  lack  track  stack  nach  plaque  rack  sac  sack  hack  aback  fac  knack  lac  shack  mac  mak  whack  wrack  yak  mack  thumbtack  wack  yack  crack  slack  smack  snack  flak  quack  clack  ipecac  lumberjack  claque  flack  repack  anorak  highjack  mudpack  elegiac  maniac  shellac  zodiac  gunnysack  razorback  rickrack  skyjack  cardiac  paperback  counterattack  almanac  hardtack  piggyback  amnesiac  applejack  crackerjack  pickaback  quarterback  demoniac  haversack  stickleback  insomniac  nymphomaniac  steeplejack  megalomaniac  Words that almost rhyme with unionjack
bag  tag  dag  drag  lag  rag  gag  hag  stag  wag  brag  fag  mag  nag  sag  zag  shag  blag  toerag  flag  slag  crag  snag  swag  dishrag  fleabag  nosebag  scrag  washrag  sleazebag  chinwag  saddlebag  wigwag  lollygag  lallygag  scalawag  scallywag  bank  task  tank  bask  dank  talc  basque  rank  blank  thank  drank  mask  sank  plank  cask  masque  shank  hanc  lank  prank  hank  spank  stank  unmask  yank  embank  flank  flask  frank  crank  shrank  franc  clank  swank  outrank  riverbank  antitank  charabanc  databank  pointblank