1. Sanatorium
  2. Hangar
  3. Hippodrome
  4. Arena
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1 Answers

Answer: Option 3

One word substitute is Hippodrome. Sanatorium: an establishment for the medical treatment of people who are convalescing or have a chronic illness. Hangar: a large building with an extensive floor area, typically for housing aircraft. Hippodrome: a stadium for chariot or horse races. Arena: a level area surrounded by seating, in which sports, entertainments, and other public events are held.

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