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