Plural and singular of nouns

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Across
  1. 3. Plural of Man
  2. 4. Singular of Cats
  3. 6. Singular of Eggs
  4. 8. Plural of Day
  5. 10. Plural of Boy
  6. 12. Singular of Buses
  7. 13. Singular of Classes
  8. 16. Plural of Child
  9. 17. Plural of Sister
  10. 18. Plural of Lady
Down
  1. 1. Plural of Woman
  2. 2. Plural of Tomato
  3. 5. Singular of Babies
  4. 7. Plural of Girl
  5. 9. Plural of Church
  6. 10. Plural of Box
  7. 11. Plural of Student
  8. 14. Plural of Hat
  9. 15. Plural of Wife
  10. 16. Plural of Chair