burial chamber vs sepulture

burial chamber and sepulture both are nouns.

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

As nouns, burial chamber and sepulture are synonyms defined as:

Other synonyms of burial chamber include sepulcher, sepulchre.

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