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