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