whippletree vs swingletree

whippletree and swingletree both are nouns.

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

As nouns, whippletree and swingletree are synonyms defined as:

whippletree and swingletree: 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 whippletree include whiffletree.

whippletree (noun)	swingletree (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