sub, super, sur

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Across
  1. 3. Not fully aware; occurring below your level of thinking and awareness
  2. 5. An extra tax beyond the normal tax
  3. 7. Splendid;excellent;beyond the expected
  4. 8. Above average in quality;excellent
  5. 12. A passage way under the ground; an electric underground railway
  6. 14. A watercraft that stays under water
  7. 15. A person who is under someone else in rank or importance
  8. 16. To bring under control
  9. 17. To water something from under the ground
  10. 18. A person with the highest power;power above everyone else’s
Down
  1. 1. A person who stands over or above someone in rank; a manager in charge of someone else
  2. 2. Under the skin
  3. 4. An amount of money (charge) over and above what is already being paid
  4. 6. To lay or place something over something else
  5. 7. Something that is beyond what is expected
  6. 8. Below freezing point
  7. 9. Beyond what is believable;bizarre
  8. 10. To put under someone else's control
  9. 11. A quantity or amount over and above what is actually needed;extra
  10. 13. To put under water