Noun number

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Across
  1. 2. the plural of elf
  2. 5. the plural of child
  3. 7. the singular of ladies
  4. 9. the plural of fish
  5. 11. the singular of knives
  6. 13. the plural of lady
  7. 15. the singular of babies
  8. 18. the plural of spy
  9. 19. the plural of leaf
  10. 20. the plural of city
  11. 21. the singular of sheep
Down
  1. 1. the singular of cities
  2. 3. the plural of shelf
  3. 4. the singular of halves
  4. 6. the plural of loaf
  5. 8. the singular of toffees
  6. 10. the plural of mouse
  7. 12. the plural of foot
  8. 14. the plural of daisies
  9. 16. the plural of tomato
  10. 17. the singular of lives