Here's what rhymes with aspidospermine.
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laburnum person burden burthen churchmen turban bourbon churchman personne sturgeon burgeon certain version urine curtain dispersion surgeon suburban workman werden worsen overburden worden wurden zircon aspersion assertion aversion coercion diversion immersion desertion perversion subversion submersion churchwarden unburden interspersion uncertain insertion excursion exertion inversion reversion incursion recursion interurban businessperson exurban nonperson weatherperson conversion introversion transferrin neurosurgeon reassertion overexertion reinsertion anchorperson extraversion extroversion animadversion congressperson