Here's what rhymes with extensum.
Words that almost rhyme with extensum
extension tension pension gentian attention mention dimension contention retention strengthen suspension detention dissension ascension distension lengthen convention invention prevention hypertension pretension declension apprehension condescension comprehension reinvention reprehension misapprehension incomprehension denim jetsam venom plenum bedlam phenom seldom spectrum welcome rectum septum harem addendum vellum velum webcam envenom momentum referendum cerebellum flagellum plectrum unwelcome bubblegum antebellum antiserum interregnum