Singular and plural.

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Across
  1. 1. Dog
  2. 7. Tomato
  3. 8. Baby
  4. 9. Aircraft
  5. 13. Mushroom
  6. 15. Person
  7. 16. Street
  8. 18. Man
  9. 19. City
Down
  1. 2. Spy
  2. 3. Bat
  3. 4. Cat
  4. 5. Half
  5. 6. Wishes
  6. 10. Fish
  7. 11. Bus
  8. 12. Box
  9. 14. House
  10. 17. Tomato