lets see
1)Tom is described as oldest of the old. If this is an accurate discription of him, then he could not be Angmar, cause Angmar was a "mortal man doomed to die"
2)Gandalf had no reason to tell how his meeting was, but if Bombadil was not at his house, then there would be a reason to talk about him.
3)Elrond, Gandalf, and Aragorn knew Bombadil. They also knew the Witchking. It would be insulting their inteligence to say they wouldn't know if they were the same person.
4)Ringwraiths (Angmar included) do not have physical bodies. That is why they have the cloaks. Tom has a physical body.
5)The Ringwraths have an aura of fear surrounding them. Tom does not.
If you want more reasons i can probably come up with them
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