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on
these are both words that look different but are still a word upside down.
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I'm not sure exactly what you mean. I guess you could write the letters upside down. If you write the words upside down, the letters will be in reverse order and won't cross correctly. Most crosswords have 180 degree symmetry, so if you turn the puzzle upside down, you could enter the words but the numbers won't line up. The bottom line is you can do whatever you want, but you will have diminishing success in actually finishing the puzzle, which is mostly the point for me.