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