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