overleap vs vault

overleap is not a noun while vault is a noun.

Word	Noun	Adjective	Verb	Adverb
overleap	No	No	Yes	No
vault	Yes	No	Yes	No

As verbs, overleap and vault are synonyms defined as:

overleap (noun)	vault (noun)
	the act of jumping over an obstacle
	an arched brick or stone ceiling or roof
	a burial chamber (usually underground)
	a strongroom or compartment (often made of steel) for safekeeping of valuables

overleap (verb)	vault (verb)
leave undone or leave out	bound vigorously
jump across or leap over (an obstacle)	jump across or leap over (an obstacle)
defeat (oneself) by going too far