Here's what rhymes with subastringent.
                        
                        
                    
                                stringent  astringent  contingent  Words that almost rhyme with subastringent
pendent  disenchant  brilliant  limit  minute  digit  pigment  richest  shipment  rivet  triplet  abridgment  flippant  abridgement  midget  brisket  deliquescent  privet  jennet  trivet  briskest  fitment  spirit  sufficient  visit  distant  efficient  nearest  witnessed  biggest  deficient  fulfillment  malignant  ticket  dearest  delinquent  enrichment  fulfilment  adherent  cricket  frigate  illicit  infringement  millet  picket  pivot  proficient  strictest  billet  biscuit  fiercest  fittest  resilient  violinist  bigot  delimit  diffident  grimaced  impingement  sublimate  wicket  demised  spigot  civet  gymnast  limpet  tippet  trinket  bewitchment  devilment  dimmest  grimmest  officiant  sickest  stiffest  divot  reshipment  shrillest  slickest  slimmest  whippet  giblet  hiccoughed  hippest  equipment  commitment  assistant  explicit  inherent  persistent  coherent  implicit  indifferent  resistant  simplest  indignant  prohibit  distanced  enlistment  omniscient  severest  skillet  oviduct  endearment  palimpsest  snippet  gimlet  maleficent  preterit  queerest  weirdest  austerest  dispirit  coefficient  insufficient  existent  inefficient  inhibit  intermittent  reminiscent  beneficent  insistent  cleverest  complicit  sincerest  swiftest  transshipment  outdistanced  encystment  inspirit  reenlistment  consistent  incoherent  nonmalignant  nonexistent  equidistant  coexistent  nonresistant  inconsistent  immunodeficient