one word substitution

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Across
  1. 4. VIBGYOR
  2. 6. bird's home
  3. 7. king of jungle
  4. 8. place for homeless children
  5. 11. an animated screenplay
Down
  1. 1. make their own food
  2. 2. flesh eaters
  3. 3. a cunning animal
  4. 5. pink city
  5. 9. holy city
  6. 10. festival of colours