Here's what rhymes with commotum.
erratum Words that almost rhyme with commotum
mutton button unbutton piton nubbin sudden glutton dudgeon dubbin androgen exciton globin bludgeon scutcheon escutcheon bellybutton custom accustom cementum caecum conundrum buxom colostrum corundum buncombe bunkum dumdum humdrum jejunum secundum carborundum