Thesaurus.com

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Across
  1. 4. subtle
  2. 6. prohibit
  3. 8. compulsory
  4. 10. claim
  5. 11. factor
  6. 12. crucial
Down
  1. 1. retain
  2. 2. difference
  3. 3. example
  4. 5. famous
  5. 7. various
  6. 9. typical