British Vs American English

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Across
  1. 5. Organize
  2. 6. Favorite
  3. 9. Liter
  4. 11. Neighbor
  5. 12. Flashlight
  6. 14. Apartment
  7. 16. Mom
  8. 17. Vacation
  9. 18. Truck
  10. 19. Airplane
  11. 20. Gray
  12. 21. Center
Down
  1. 1. Humor
  2. 2. Mailbox
  3. 3. Sidewalk
  4. 4. Meter
  5. 7. Apologize
  6. 8. Flavor
  7. 10. Realize
  8. 13. Color
  9. 15. Theater