Architecture crossword

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Across
  1. 2. other word for timber
  2. 5. a strong metal made from iron used in construction
  3. 6. a reddish brown metal
Down
  1. 1. A railing supported by balusters, forming a parapet to balcony etc..
  2. 3. a platform out side a building with a wall or railing around it.
  3. 4. a round roof on a building