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