Headstone and Monuments

Headstone 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.

Monuments and headstone are semantically related In some cases you can replace term "Monuments" with "Headstone", this nouns are similar.

Headstone and monuments are semantically related in memorial topic. You can use "Headstone" instead a noun "Monuments".