Cenotaph and Tombstone

Cenotaph noun - A monument built to honor people whose remains are interred elsewhere or whose remains cannot be recovered.

Tombstone and cenotaph are semantically related in memorial topic. In some cases you can use "Tombstone" instead a noun "Cenotaph".

Tombstone noun - A shaped stone laid over or erected near a grave and usually bearing an inscription to identify and preserve the memory of the deceased.

Cenotaph and tombstone are semantically related in grave marker topic. You can use "Cenotaph" instead a noun "Tombstone".