Word building - make up nouns

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Across
  1. 1. arrive
  2. 5. know
  3. 6. fly
  4. 7. kind
  5. 11. deliver
  6. 12. invite
  7. 13. behave
  8. 16. depart
  9. 17. refuse
  10. 18. prove
  11. 19. choose
Down
  1. 2. assist
  2. 3. explain
  3. 4. invent
  4. 8. improve
  5. 9. sign
  6. 10. poor
  7. 14. educate
  8. 15. marry