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