Here's what rhymes with existian.
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system piston wisdom ecosystem vision hidden kitchen listen fiction excision fission silken villain sylvan thicken given women written million mission billion friction arisen chicken incision linen risen crimson ignition ribbon ridden bitten diction kinsmen pigeon envision eviction kitten pinion quicken smitten riven stiffen children position addition decision opinion division commission conviction driven edition physician prison civilian collision emission extinction revision addiction affliction forgiven omission stricken derision encryption fruition pavilion sedition technician volition infliction striven trillion vermilion audition midshipman condition description opposition religion permission provision acquisition admission ambition petition precision suspicion coalition cognition dominion exhibition inhibition inscription intuition submission clinician imposition musician remission tuition apparition attrition depiction magician rewritten unwritten apposition dentition imprison indecision inquisition nonfiction rendition ascription bouillon disquisition logician overridden reptilian definition distinction tradition composition television transition disposition expedition supervision abolition deposition exposition nutrition partition prediction restriction penicillin supposition circumcision conscription constriction crucifixion erudition preposition requisition contrition intermission patrician electrician interdiction rhetorician theoretician competition jurisdiction recognition transmission proposition repetition ammunition politician prescription prohibition superstition subdivision subscription admonition benediction demolition extradition interposition dereliction manumission premonition proscription underwritten contradiction decomposition transcription mathematician indisposition precondition redefinition superposition obstetrician statistician juxtaposition malnutrition predisposition transposition presupposition pediatrician superimposition contradistinction