word formation as asked in brackets

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Across
  1. 4. national (noun)
  2. 6. operate (noun)
  3. 8. peaceful (noun)
  4. 9. see (noun)
  5. 12. weigh (noun)
  6. 13. relief (dj
  7. 15. invite (noun)
  8. 17. noisy (noun)
  9. 18. anxiety (adj)
  10. 19. deep (noun)
Down
  1. 1. permit (noun)
  2. 2. know (noun)
  3. 3. disappoint (adj)
  4. 5. marry (noun)
  5. 7. shame (adj)
  6. 10. prepare (noun)
  7. 11. paint (noun)
  8. 14. envy (adj)
  9. 16. think(noun)