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