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