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