Here's what rhymes with tremendum.
referendum Words that almost rhyme with tremendum
tendon momentum dentin intention hempen indention distention inattention abstention subvention intervention contravention circumvention supervention 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