One word substitution - BITSAT #3

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Across
  1. 6. One who is both inwards and outwards at times
  2. 8. The doctor who attends to child delivery
  3. 10. One who is capable of using both hands
  4. 12. One who doesn't consume alcohol
  5. 15. The doctor who deals with the female reproductive system
  6. 17. The doctor who treats bone problems
  7. 18. Well known for bad qualities
  8. 22. One who is all powerful
  9. 25. One who turns his thoughts inwards
  10. 26. One who walks at night
  11. 27. One who believes in ruthless self-aggrandizement
  12. 28. One who can throw his voice
  13. 30. One who knows a lot about good food and wine
Down
  1. 1. One who is beyond reform
  2. 2. The doctor who straightens teeth
  3. 3. One with unlimited power
  4. 4. One who is all knowing
  5. 5. The doctor who attends to corns in the feet and hands
  6. 7. One who talks while sleeping
  7. 9. One who is violently against established beliefs and traditions
  8. 11. An expert in writing by hand
  9. 13. The doctor who specializes in root canal and nerve treatment
  10. 14. One who walks in sleep
  11. 16. The doctor who treats gums
  12. 19. The doctor who treats heart problems
  13. 20. One who demands strict conformity to rules
  14. 21. The doctor who treats skin diseases
  15. 23. One who turns his thoughts outwards
  16. 24. One who exhibits courage or fearlessness
  17. 29. One who walks on ropes