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