Prefixes over, sub, under, super, out

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Across
  1. 3. A flying device that flies beyond the speed of light
  2. 5. A store that offers a lot of discounts
  3. 7. The railroad that goes under the city.
  4. 8. When you are doing extra hours on something
  5. 10. Something that is not natural, like ghosts
Down
  1. 1. A super famous person
  2. 2. The action of drawing a line under a word
  3. 4. A transportation machine that goes under the sea
  4. 6. Where you go to buy groceries, like Walmart
  5. 9. The result of a process