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