Just a sneak peek as I prepare the whole graph.  Remember these are words labeled “onomatopoeic” or “echoic” or “imitative” by the OED plus the names “Gollum” and “Roäc” and “Carc”.

Before I erase it for the comparison graph, notice the y-axis!  Many more sound words than the others – the peak reaches right up to 0.02, half of all the uncommon words in the Chapter 1 low point and Chapter 19 denouement.