Memento and Tombstone

Memento noun - Something that serves to keep alive the memory of a person or event.

Tombstone and memento are semantically related. In some cases you can use "Tombstone" instead a noun "Memento".

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.

Memento and tombstone are semantically related. Sometimes you can use "Memento" instead a noun "Tombstone".