bank vault vs vault

bank vault and vault both are nouns.

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

As nouns, bank vault and vault are synonyms defined as:

bank vault and vault: a strongroom or compartment (often made of steel) for safekeeping of valuables

bank vault (noun)	vault (noun)
a strongroom or compartment (often made of steel) for safekeeping of valuables	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

bank vault (verb)	vault (verb)
	bound vigorously
	jump across or leap over (an obstacle)