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