Word formation - People

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Across
  1. 2. Somebody who participates in something.
  2. 4. Somebody who instructs other people.
  3. 5. Somebody who works in chemistry or studies it.
  4. 7. Somebody who supplies something.
  5. 9. Somebody who works in a library.
Down
  1. 1. Somebody who drives a motor vehicle.
  2. 3. Somebody who seeks refuge from a disaster.
  3. 6. Somebody who survives an accident.
  4. 7. Somebody who specialises in something.
  5. 8. Somebody who presents a TV show.