Difference between Whiffletree and Whippletree

What is the difference between Whiffletree and Whippletree?

Whiffletree as a noun is a whippletree while Whippletree as a noun is a wooden crossbar for a plough or carriage, pivoted in the middle, from which traces are fastened to a draught animal

We hope you now know whether to use Whiffletree or Whippletree in your sentence.