Irregular plural nouns

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Across
  1. 3. wife
  2. 6. person
  3. 8. fish
  4. 12. leaf
  5. 13. woman
  6. 14. thief
  7. 15. scarf
  8. 17. man
  9. 18. goose
  10. 19. foot
Down
  1. 1. knife
  2. 2. tooth
  3. 4. life
  4. 5. child
  5. 7. elf
  6. 9. wolf
  7. 10. goose
  8. 11. mouse
  9. 16. sheep