Here's what rhymes with complimentarity.
                        
                        
                    
                                parity  rarity  verity  clarity  polarity  temerity  prosperity  similarity  sincerity  disparity  posterity  dexterity  celerity  hilarity  familiarity  solidarity  insincerity  bipolarity  capillarity  popularity  regularity  singularity  granularity  subsidiarity  unfamiliarity  angularity  peculiarity  irregularity  Words that almost rhyme with complimentarity
parody  therapy  fidelity  melody  chemotherapy  hypnotherapy  psychotherapy  radiotherapy  physiotherapy  hydrotherapy  density  integrity  penalty  deputy  heresy  terribly  brevity  merrily  warily  wearily  apparently  carefully  identity  necessity  heavily  intensity  readily  destiny  seventy  specially  steadily  jealousy  legacy  temporarily  heredity  peasantry  specialty  indemnity  leprosy  longevity  pedigree  serenity  severally  tenancy  verily  militarily  sesame  amenity  pedantry  unbearably  velvety  tenantry  testily  acerbity  devilry  prayerfully  retinae  temperately  necessarily  primarily  tendency  chemistry  presently  heavenly  mentally  centrally  chemically  hegemony  momentarily  pleasantly  transparency  carelessly  felony  dentistry  dreadfully  immensity  jealously  medically  secondarily  weaponry  heraldry  inequity  pleasantry  revelry  telemetry  telepathy  transparently  impeccably  legibly  nonentity  unsteadily  blessedly  negligee  essentially  complexity  potentially  pregnancy  extremity  ordinarily  secondly  supremacy  voluntarily  allegedly  incidentally  incessantly  perplexity  sensibly  solemnity  unnecessarily  clemency  convexity  recklessly  breathlessly  indelibly  mastectomy  unpleasantly  credibly  helpfully  impetuously  tangentially  independently  dependency  arbitrarily  ostensibly  ascendancy  customarily  helplessly  incredibly  ascendency  biochemistry  contentedly  hysterectomy  insensibly  restlessly  splendidly  confessedly  flexibly  professedly  biochemically  geochemistry  inclemency  sentimentally  vasectomy  successfully  fundamentally  accidentally  discrepancy  expectancy  respectfully  conscientiously  tremendously  unsuccessfully  exponentially  marvellously  preferentially  sequentially  acceptably  clandestinely  coincidentally  confidentially  expectantly  inexpressibly  lamentably  providentially  regretfully  existentially  incontestably  indispensably  instrumentally  quintessentially  regrettably  resentfully  respectably  temperamentally  unacceptably  environmentally  contemptuously  developmentally  relentlessly  incrementally  tonsillectomy  extraordinarily  superintendency  experimentally