I agree- not everything can be pigeonholed; and Tolkien *never* tells us that the classes of beings he names for us are exhaustive. He called Tom the 'spirit of the countryside', and that's as much as we can know.
BTW, I really can't square Tom, the ultimate tree-hugger, with "but still [my Dwarves] will have need of wood" Aule.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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