Add -s or -es to make plural nouns

123456789
Across
  1. 3. Two-wheeled transportation that requires balance
  2. 5. What brightens rooms
  3. 6. Faint humming from insects
  4. 7. Confined spaces or enclosures for birds
  5. 9. Wooden parts of a tree
Down
  1. 1. Cookware used for meals
  2. 2. What opens locks
  3. 4. What students attend
  4. 6. Square containers, often for shipping
  5. 8. Creatures found in zoos