Singular to plural common nouns

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Across
  1. 2. man
  2. 4. tooth
  3. 6. chair
  4. 8. desk
  5. 10. box
  6. 12. party
  7. 14. fox
Down
  1. 1. foot
  2. 3. city
  3. 5. girl
  4. 7. horse
  5. 8. Dog
  6. 9. tax
  7. 11. baby
  8. 13. monkey