The debate concerning Bombadil is one of the chief controverises surrounding the LOTR. I do not comment upon what he is or might be - it doesn't matter in my mind. He just is. He is Oldest and Fatherless. And that is good enough for me.
As for Ents, they are neither men nor trees, as has been said before. THey are tree herds.
On a side note, I think it amazing that Treebeard is older than Galadriel. She adresses him as such when they meet at then end of ROTK.
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