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