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