What is the plural form?

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Across
  1. 3. person
  2. 6. mango
  3. 9. child
  4. 11. knife
  5. 13. grave
  6. 14. candy
  7. 16. fish
Down
  1. 1. woman
  2. 2. leaf
  3. 4. radio
  4. 5. motorcycle
  5. 7. baby
  6. 8. sheep
  7. 10. tree
  8. 12. man
  9. 15. dog