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