Singular to plural nouns

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Across
  1. 4. potato
  2. 5. wish
  3. 6. boat
  4. 8. life
  5. 9. man
  6. 12. river
  7. 13. child
  8. 16. city
  9. 17. knife
  10. 18. leaf
Down
  1. 1. bus
  2. 2. pitch
  3. 3. box
  4. 5. woman
  5. 6. baby
  6. 7. tooth
  7. 10. elves
  8. 11. half
  9. 13. cat
  10. 14. daisy
  11. 15. mouse