Here's what rhymes with sumendum.
referendum Words that almost rhyme with sumendum
tendon momentum dentin intention hempen subvention indention inattention abstention circumvention supervention intervention distention contravention nonintervention seldom venom addendum denim phenom welcome unwelcome harem plenum vellum bedlam velum jetsam webcam envenom rectum septum flagellum spectrum cerebellum plectrum bubblegum antebellum antiserum interregnum