Here's what rhymes with somptuosité.
                        
                        
                    
                                possit  Words that almost rhyme with somptuosité
deposit  sonnet  locket  plaudit  polished  broadest  forfeit  cockpit  tallest  czarist  hornet  monist  grommet  horseshit  palmist  wannest  comfit  rollicked  tautest  fawnest  abolished  convict  shortest  admonished  demolished  tarnished  garnished  jaundiced  psalmist  ravished  varnished  starlit  frolicked  harpist  quartette  goddammit  recommit  varmint  baldest  flautist  morticed  shoplift  spotlit  stockist  bollixed  frostbit  placekicked  conflict  astonished  conscript  aftermarket  forklift  tobacconist  shortlist  downmarket  swankest  accomplished  impoverished  reformist  supermarket  untarnished  unvarnished  allegorist  hypermarket  conformist  unaccomplished  harpsichordist  monologuist  nonconformist