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