Here's what rhymes with diffiisivity.
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specificity felicity elasticity toxicity periodicity infelicity rusticity simplicity publicity plasticity domesticity catholicity electricity complicity eccentricity egocentricity vicinity affinity symmetry vividly acidity chivalry civility simile fixity rickety servility villainy virility finicky ability sympathy dignity hostility validity divinity fertility tyranny feasibility infinity visually asymmetry bigotry minutely salinity solidity symphony agility fearfully fluidity litany trinity cheerily docility fitfully senility signally bigamy billowy timothy wittily fiscally privily scurrility willowy possibility ministry mobility utility nobility officially proximity cheerfully humidity rapidity rigidity viability visibly busily facsimile futility skillfully timidity debility distally epitome fearlessly fragility prettily sociability sublimity timidly turbidity versatility wilfully invalidity ritually viciously willfully dismally divisibility flippancy frigidity guiltily placidity tearfully dizzily flippantly stolidity efficiency sufficiently differently initially antiquity efficiently inherently morbidity sufficiency antipathy femininity liquidity volatility assiduously ductility indignity polygamy soliloquy wistfully admissibility amiability beneficially distantly epiphany exigency hospitably invisibility reversibility coherency legibility aborigine abysmally diffidently probability availability deficiency explicitly flexibility capability conspiracy implicitly reliability insufficiency tranquillity brilliancy brilliantly inefficiency irritability persistently religiously unanimity alkalinity insufficiently irresistibly suspiciously blissfully calligraphy insistently invisibly judicially listlessly resiliency stringency unofficially incoherently indivisibility inefficiently malleability polyphony prolixity quizzically stringently auspiciously invincibly consistently consistency applicability artificially masculinity proficiency susceptibility adaptability indifferently indignantly intermittently malignancy superficially magnanimity deliciously inaccessibility inviolability affordability minstrelsy pusillanimity ambitiously fictitiously responsibility contingency delinquency inconsistency acceptability compatibility irresponsibility predictably surreptitiously expeditiously improbability inexplicably contingently inconsistently practicability impracticability unpredictably immunodeficiency