Here's what rhymes with certaint.
                        
                        
                    
                                inadvertent  Words that almost rhyme with certaint
urgent  serpent  verdant  merchant  divergent  burdened  emergent  insurgent  resurgent  burgeoned  convergent  detergent  overburdened  unburdened  servant  fervent  current  circuit  hermit  furthest  currant  ergot  firmest  surfeit  worshipped  observant  turret  deferment  sherbet  sternest  purchased  recurrent  conversant  deterrent  discernment  adjournment  preferment  diarist  innervate  manservant  resurfaced  conferment  concurrent  internment  disbursement  unobservant  colourist  absurdest  interpret  undercurrent  repurchased  blackcurrant  liturgist  nonobservant  reimbursement  behaviourist  taxidermist  microcircuit  misinterpret  reinterpret  metallurgist