Irregular nouns

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Across
  1. 6. man
  2. 8. woman
  3. 10. child
  4. 11. story
  5. 13. ski
  6. 16. university
  7. 17. thief
  8. 18. goose
  9. 19. fish
Down
  1. 1. gymnastics
  2. 2. leaf
  3. 3. ox
  4. 4. party
  5. 5. comedy
  6. 7. mouse
  7. 9. politics
  8. 12. news
  9. 14. sheep
  10. 15. knife
  11. 17. tooth