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