headstone is a compound of head (the stone set at the head of a grave) and stone, both of Old English origin (heafod, stān). Morphologically, the word is best read through the components named in the history, with the modern spelling preserving a compound structure rather than a single unanalyzable stem. In present English, the noun sense is "a stone marker set at the head of a grave", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as head and stone. Its semantic neighborhood includes gravestone, tombstone, marker, and memorial, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Old English heafod and Old English stān.