Irregular plurals

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Across
  1. 4. The coverings on top of houses/buildings.
  2. 6. Metal objects used to unlock doors or
  3. 7. Big farm animals used to pull heavy loads in the olden days.
  4. 9. Wall-mounted boards for storing/displaying items
  5. 10. Sticks used to light fires (or games between
  6. 13. Public transport vehicles carrying passengers.
  7. 14. Large towns with lots of people and buildings.
Down
  1. 1. Containers used for storage or packing.
  2. 2. The wives of knights.
  3. 3. Clever wild animals known for their bushy
  4. 5. Wild animals like big dogs that live in packs.
  5. 6. Sharp tools used for cutting food.
  6. 8. Married women.
  7. 10. Primates that climb in trees; many species
  8. 11. Things children play with.
  9. 12. tails.