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