sepulcher vs vault

sepulcher and vault both are nouns.

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

As nouns, vault is a hyponym of sepulcher; that is, vault is a word with a more specific, narrower meaning than sepulcher:

Other hyponyms of sepulcher include crypt, mausoleum, monument, repository, burial vault.

sepulcher (noun)	vault (noun)
a chamber that is used as a grave	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

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