One word substitution

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Across
  1. 6. A cinema show which is held in the afternoon
  2. 7. A pen name used by an author
  3. 8. A great lover of books
  4. 10. One who questions everything
  5. 11. A group of judges
  6. 15. That cannot be touched
  7. 16. An exact copy
  8. 18. A supposed cure for all diseases or problems
  9. 19. A person who has faith in the existence of god
Down
  1. 1. A person who is new to a trade or profession
  2. 2. A thing that is fit to be eaten as food
  3. 3. Negotiate between opposing parties
  4. 4. Man who eats human flesh
  5. 5. That cannot be conquered
  6. 9. An unexpected fortune or wealth
  7. 12. The act of agreement by one and all
  8. 13. A person who abstains from drink
  9. 14. A medicine to counteract the effect of another medicine
  10. 17. A disease which ends in death