Here's what rhymes with pointillism.
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rhythm risen listen prison arisen riven mizzen given vision driven mission fission imprison glisten position addition decision division edition permission algorithm petition precision abolition collision emission nutrition partition revision omission remission tuition attrition derision fruition volition logarithm patrician striven audition logician stiffen ebullition rescission opposition tradition commission physician provision television admission ambition coalition incision intuition politician clinician excision forgiven ignition imposition musician apparition demolition erudition magician sedition technician apposition contrition dentition envision indecision intermission rendition cataclysm rhetorician dietitian munition prevision tactician condition definition competition composition transition disposition proposition repetition supervision suspicion ammunition cognition deposition inhibition prohibition submission supposition admonition preposition paroxysm manumission pediatrician theoretician imprecision readmission recognition transmission acquisition expedition decomposition exhibition exposition superstition subdivision malnutrition requisition transposition inquisition interposition precondition disquisition electrician obstetrician premonition academician circumcision mathematician extradition indisposition presupposition redefinition superposition statistician superimposition diagnostician juxtaposition predisposition wisdom serum theorem cecum gingham system kingdom victim dictum gypsum fearsome winsome symptom pilgrim ecosystem