Here's what rhymes with propylasum.
                        
                        
                    
                                Words that almost rhyme with propylasum
roughen  cousin  dozen  muffin  coven  toughen  discussion  percussion  perdition  caparison  repercussion  concussion  ragamuffin  erratum  custom  buxom  caecum  accustom  jejunum  buncombe  bunkum  dumdum  secundum  humdrum  colostrum  corundum  cementum  conundrum  carborundum