Here's what rhymes with asscrtiveness.
                        
                        
                    
                                forgiveness  Words that almost rhyme with asscrtiveness
business  stiffness  bismuth  agribusiness  bigness  dimness  witness  thickness  fitness  sickness  richness  stillness  quickness  pivots  minutes  bishops  vicious  digits  fictitious  tickets  auspicious  citrus  fearless  eyewitness  grimace  pickets  rivets  seditious  billets  discus  factitious  pittance  sinless  sinuous  beardless  bigots  cirrus  nimbus  pickups  villus  witless  distance  appearance  limits  spirits  visits  ambitious  clearance  mistress  suspicious  delicious  judicious  pernicious  bacillus  biscuits  brilliance  capricious  viscous  assiduous  listless  litmus  papyrus  strictness  swiftness  thickets  trinkets  crickets  cystitis  hillocks  officious  triplets  unfitness  hibiscus  litigious  riddance  wickets  windlass  windless  wingless  religious  adherence  exhibits  coherence  malicious  prodigious  admittance  hindrance  pigments  diffidence  elicits  frigates  nutritious  propitious  avaricious  indigence  surreptitious  mastitis  profitless  snippets  solicits  unambitious  existence  assistance  disappearance  persistence  subsistence  adherents  inhibits  shipments  superstitious  prestigious  prohibits  adventitious  archbishops  contingents  distinctness  meniscus  reappearance  eucalyptus  expeditious  injudicious  irreligious  remittance  repetitious  resistless  unpropitious  resistance  coefficients  interference  assistants  commitments  insistence  perseverance  delinquents  consistence  incoherence  endearments  coexistence  reminiscence  transmittance  nonreligious  infringements  nonexistence  enlistments  noninterference