vault vs sepulture

vault and sepulture both are nouns.

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

As nouns, sepulture is a hypernym of vault; that is, sepulture is a word with a broader meaning than vault:

Other hypernyms of vault include burial chamber, sepulcher, sepulchre.

vault (noun)	sepulture (noun)
the act of jumping over an obstacle	a chamber that is used as a grave
an arched brick or stone ceiling or roof	the ritual placing of a corpse in a grave
a burial chamber (usually underground)
a strongroom or compartment (often made of steel) for safekeeping of valuables

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