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