Gravestone and Obelisk

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.

Obelisk and gravestone are semantically related. in memorial topic. In some cases you can use "Obelisk" instead a noun "Gravestone".

Obelisk noun - A stone pillar having a rectangular cross section tapering towards a pyramidal top.

Gravestone and obelisk are semantically related. You can use "Gravestone" instead a noun "Obelisk".