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