Cenotaph and Gravestone

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

Gravestone and cenotaph are semantically related in memorial topic. In some cases you can use "Gravestone" instead a noun "Cenotaph", when it comes to topics like grave marker.

Gravestone 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 gravestone are semantically related in memorial topic. You can use "Cenotaph" instead a noun "Gravestone", if it concerns topics such as grave marker.