Doing this, the "O"'s and the "X" don't change, but the "Z"'s turn into "N"'s.
Now, it's easy to complete the grid with many sets of words. One of them, for example, is CONE, OXID, NICE and EDEN.
+---+---+---+---+
| C | O | N | E |
+---+---+---+---+
| O | X | I | D |
+---+---+---+---+
| N | I | C | E |
+---+---+---+---+
| E | D | E | N |
+---+---+---+---+
I choose these ones only by the fact that the word in the n-th line is the same as in the n-th column.
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