I think three varieties of return from the dead can be differentiated:
Rebirth: The spirit returns in the body of a newly-born infant. This was Tolkien's original idea for the Elves, and apparently for the Dwarf-fathers, but was later dropped for metaphysical reasons. This is sometimes called 'reincarnation' in the context of Hinduism, Buddhism, etc., but I don't think Tolkien every referred to it that way.
Reincarnation: A new (adult) body is made, fully formed, for the returning spirit. This was Tolkien's later idea for the manner of the Elves' return from death.
Resurrection: The original body, still intact, is re-inhabited by the spirit. This was apparently Tolkien's later idea for the manner of the Dwarf-fathers' return (from, I believe, 'Of Dwarves and Men').
The names could perhaps be quibbled with (and actually, I don't recall Tolkien using the word 'resurrection'), but I think the different concepts are clearly delineated. The Turin and Gandalf examples are clearly reincarnation. The Beren example was either reincarnation or resurrection. But the important points are that: 1. Tolkien eventually rejected the idea of 'rebirth' entirely, and 2. the occurrence of any of these things for the spirit of a human is quite exceptional.
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