Here's what rhymes with eighttenth.
tenth Words that almost rhyme with eighttenth
dense tense tens pence pens dens gens sense hence lens thence whence fence gems hens fens defence defense intense immense offence offense stems cleanse glens hems expense commence dispense incense suspense pretense condense halfpence twopence condemns theorems sixpence harems recompense morphemes recommence commonsense frankincense death depth health wealth breath breadth stealth neath length twelfth strength shibboleth commonwealth