Here's what rhymes with demesne.
                        
                        
                    
                                fluorescein  Words that almost rhyme with demesne
men  pn  then  when  ten  den  pen  hen  ben  ken  sen  yen  fn  wen  wenn  amen  cairn  chen  denn  fen  jen  ren  wren  pitchmen  again  againe  glen  moderne  cayenne  lawmen  oilmen  penmen  ramequin  relearn  conmen  businessmen  middlemen  handymen  minutemen  anchormen  weathermen  patrolmen  comedienne  signalmen  councilmen  tragedienne  equestrienne