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