burial chamber vs sepulchre

burial chamber and sepulchre both are nouns.

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

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

Other synonyms of burial chamber include sepulcher, sepulture.

burial chamber (noun)	sepulchre (noun)
a chamber that is used as a grave	a chamber that is used as a grave