whiffletree vs whippletree

whiffletree and whippletree both are nouns.

Word	Noun	Adjective	Verb	Adverb
whiffletree	Yes	No	No	No
whippletree	Yes	No	No	No

As nouns, whiffletree and whippletree are synonyms defined as:

whiffletree and whippletree: a crossbar that is attached to the traces of a draft horse and to the vehicle or implement that the horse is pulling

Other synonyms of whiffletree include swingletree.

whiffletree (noun)	whippletree (noun)
a crossbar that is attached to the traces of a draft horse and to the vehicle or implement that the horse is pulling	a crossbar that is attached to the traces of a draft horse and to the vehicle or implement that the horse is pulling