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