Here's what rhymes with onages.
                        
                        
                    
                                nonages  Words that almost rhyme with onages
cornices  varnishes  polishes  orisons  garnishes  tarnishes  ravishes  yardages  chronicles  follicles  vortices  cortices  drawbridges  prodigals  modicums  demolishes  swastikas  cardigans  harmonicas  martingales  hospitals  impoverishes  signorinas  periodicals  polymorphisms