vault vs sepulcher

vault and sepulcher both are nouns.

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

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

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

vault (noun)	sepulcher (noun)
the act of jumping over an obstacle	a chamber that is used as a grave
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

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