Here's what rhymes with oncograph.
                        
                        
                    
                                laugh  graph  half  calf  chaff  gaff  staff  autograph  giraffe  digraph  behalf  paragraph  monograph  epigraph  holograph  polygraph  photograph  telegraph  epitaph  phonograph  lithograph  mimeograph  Words that almost rhyme with oncograph
class  glass  grass  crash  wrath  clash  rash  lash  lass  crass  lath  has  have  gas  mass  pass  path  cash  hath  bath  brass  flash  alas  bass  dash  jazz  math  trash  cache  sash  hash  mash  slash  bras  brash  gash  thrash  bash  halve  whereas  smash  splash  harass  amass  morass  underclass  hourglass  stash  surpass  impasse  aftermath  fiberglass  psychopath  sassafras