1) I think there's some overlapping in usage. Sometimes a family of several generations is/are buried in the same large plot, and each member's exact spot will be marked by a headstone, while the whole plot will be marked by a much larger and more elaborate edifice. I believe in Tombstone, Arizona the tombstones on Boot Hill were all pretty simple.
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CliveI don't remember hearing the term 'gravestone' actually used.Really?!!! Members of my family use it quite often! More often than tombstone, in fact! How curious.