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