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