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