crypt vs burial chamber

crypt and burial chamber both are nouns.

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

As nouns, burial chamber is a hypernym of crypt; that is, burial chamber is a word with a broader meaning than crypt:

crypt: a cellar or vault or underground burial chamber (especially beneath a church)
burial chamber: a chamber that is used as a grave

Other hypernyms of crypt include sepulcher, sepulchre, sepulture.

crypt (noun)	burial chamber (noun)
a cellar or vault or underground burial chamber (especially beneath a church)	a chamber that is used as a grave