interment vs sepulture

interment and sepulture both are nouns.

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

As nouns, interment and sepulture are synonyms defined as:

Other synonyms of interment include burial, entombment, inhumation.

interment (noun)	sepulture (noun)
the ritual placing of a corpse in a grave	a chamber that is used as a grave
	the ritual placing of a corpse in a grave