burial vs sepulture

burial and sepulture both are nouns.

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

As nouns, burial and sepulture are synonyms defined as:

Other synonyms of burial include entombment, inhumation, interment.

burial (noun)	sepulture (noun)
concealing something under the ground	a chamber that is used as a grave
the ritual placing of a corpse in a grave	the ritual placing of a corpse in a grave