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