Here's what rhymes with decuplet.
                        
                        
                    
                                couplet  Words that almost rhyme with decuplet
gullet  kaput  puppet  covet  mullet  decollete  summit  bucket  musket  buffet  compassed  dullest  dulcet  pundit  davit  dovecote  duvet  cultist  dovecot  youngest  trumpet  pungent  apposite  roughest  toughest  pedant  plummet  sibilant  subtlest  occultist  reanimate  dumbest  justest  muralist  refaced  judgment  abundant  judgement  resultant  incumbent  triumphant  encompassed  recumbent  buttressed  exultant  ebullient  effulgent  refulgent  strumpet  atomised  discussant  bluntest  stomached  adjustment  reluctant  consultant  redundant  indulgent  repugnant  abutment  inelegant  engulfment  demulcent  prejudgment  readjustment  superabundant  misjudgment  magniloquent  overabundant  misjudgement  maladjustment  overindulgent