What's that?

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Across
  1. 1. sofa
  2. 5. black
  3. 8. white
  4. 9. green
  5. 11. doll
  6. 13. yellow
  7. 14. umbrella
  8. 17. toy box
  9. 18. key
Down
  1. 1. small
  2. 2. big
  3. 3. window
  4. 4. red
  5. 5. ball
  6. 6. chair
  7. 7. bed
  8. 10. nine
  9. 12. blue
  10. 15. mouth
  11. 16. house