whiffletree vs crossbar

whiffletree and crossbar both are nouns.

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

As nouns, crossbar is a hypernym of whiffletree; that is, crossbar is a word with a broader meaning than whiffletree:

whiffletree: a crossbar that is attached to the traces of a draft horse and to the vehicle or implement that the horse is pulling
crossbar: a horizontal bar that goes across something

whiffletree (noun)	crossbar (noun)
a crossbar that is attached to the traces of a draft horse and to the vehicle or implement that the horse is pulling	long thin horizontal crosspiece between two vertical posts
	game equipment consisting of a horizontal bar to be jumped or vaulted over
	a horizontal bar that goes across something