Burial vault and Burial chamber

Burial vault noun - A burial chamber (usually underground).

Burial chamber and burial vault are semantically related. In some cases you can use "Burial chamber" instead a noun phrase "Burial vault".

Burial chamber noun - A chamber that is used as a grave.

Burial vault and burial chamber are semantically related. Sometimes you can replace phrase "Burial vault" with "Burial chamber", this phrases are similar.