Here's what rhymes with rubrum.
                        
                        
                    
                                drum  rum  plum  plumb  trom  yum  from  some  come  sum  cum  dem  thumb  comme  dumb  gum  hum  slum  zum  bum  comm  dum  mum  même  num  numb  tum  chum  crumb  sm  tem  glum  strum  thrum  become  scum  swum  scrum  sebum  spume  benumb  succumb  cerebrum  sacrum  breadcrumb  overcome  frustum  candelabrum  simulacrum  Words that almost rhyme with rubrum
young  run  lung  rung  wrung  rien  yean  one  done  son  none  sun  won  gun  tongue  fun  hung  tion  flung  sung  ton  clung  nun  sprung  dung  shun  sion  slung  strung  bun  donne  dun  fon  pun  tung  bn  cen  fron  gon  hun  jun  kung  outrun  spline  tonne  tun  ven  bung  toucan  naan  among  begun  swung  spun  stung  outdone  seisin  rerun  stun  redone  rehung  overrun  undone  unsung  cretonne  anyone  everyone  overdone  overhung  misdone  twentyone