Give one word

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Across
  1. 4. very old and/or existing from a long time ago
  2. 5. The ability to create pictures and ideas in your mind that are not real yet
Down
  1. 1. Living things depend on each other to live and grow
  2. 2. an oldest civilization in the world
  3. 3. an organised group of people with a particular purpose such as a business or a government department