-cial/-tial

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Across
  1. 4. Relating to friends or society
  2. 5. Not natural, made by humans
  3. 6. Very important
  4. 8. Possible or could happen
  5. 10. First or beginning
Down
  1. 1. Absolutely necessary
  2. 2. Something formal or approved
  3. 3. Large in amount
  4. 4. Relating to space or area
  5. 7. Private or secret
  6. 8. Not complete
  7. 9. Something unique or different