Irregular plural Forms

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Across
  1. 3. bacterium
  2. 6. fish
  3. 9. moose
  4. 12. goose
  5. 13. aircraft
  6. 14. series
  7. 15. wolf
Down
  1. 1. half
  2. 2. quiz
  3. 4. child
  4. 5. trout
  5. 6. Fungus
  6. 7. index
  7. 8. leaf
  8. 10. person
  9. 11. crisis