vaulting horse vs long horse

vaulting horse and long horse both are nouns.

Word	Noun	Adjective	Verb	Adverb
vaulting horse	Yes	No	No	No
long horse	Yes	No	No	No

As nouns, vaulting horse and long horse are synonyms defined as:

vaulting horse and long horse: a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting

Other synonyms of vaulting horse include buck.

vaulting horse (noun)	long horse (noun)
a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting	a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting