The word that best means the same as the group of words "a place where a dead person's body is burnt" is crematorium.

• Graveyard is a place where dead people are buried.
• Basement is the lowest level of a building.
• Dungeon is a dark, underground prison cell.

A crematorium is a building where dead bodies are cremated, or burnt. The cremated remains are then placed in an urn or scattered.