Burial vault and Columbarium

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

Columbarium and burial vault are semantically related. In some cases you can replace term "Columbarium" with "Burial vault", this terms are similar.

Columbarium noun - A sepulchral vault or other structure having recesses in the walls to receive cinerary urns.

Burial vault and columbarium are semantically related. Sometimes you can use "Burial vault" instead a noun "Columbarium".