Here's what rhymes with semiexternal.
                        
                        
                    
                                journal  sternal  external  eternal  colonel  kernel  diurnal  vernal  internal  maternal  paternal  fraternal  infernal  nocturnal  Words that almost rhyme with semiexternal
dermal  thermal  epidermal  isothermal  geothermal  hydrothermal  purple  turtle  chervil  burble  burgle  circle  verbal  fertile  girdle  servile  hurdle  myrtle  gurgle  curdle  hurtle  commercial  dispersal  squirrel  tubercle  epidural  hurtful  inertial  deferral  encircle  scleral  subdural  clitoral  mirthful  forkful  demurral  disbursal  reversal  referral  rehearsal  infertile  illiberal  puerperal  conferral  infomercial  nonverbal  semicircle  bicameral  noncommercial  universal  controversial  transversal  transferal  noncontroversial