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