Here's what rhymes with tiasis.
                        
                        
                    
                                pertussis  Words that almost rhyme with tiasis
buses  trusses  luscious  buzzes  maces  pluses  fusses  plusses  musses  susses  brushes  gushes  entices  knavish  clevis  rebuses  shushes  fuzzes  crushes  flushes  rhombuses  iambuses  nimbuses  minibuses  ingresses  trolleybuses  dhotis  budgets  gussets  russets  injustice  subsets  summits  lioness  pundits  rustics  aphasics  davits  unfits  junkets  spadix  muftis  admix  unfix  heretics  suffix  uplifts  drumsticks  gunships  huntress  plumpness  scentless  meninx  odalisques  sputniks  whodunits  subjects  republics  culprits  portcullis  cultists  muralists  prescripts  alembics  subscripts  constricts  occultists  sculptress  mentalists  discomfits  sextuplets  executrix  speleologists