6 words, 3 - 5 letters

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Across
  1. 1. Liquid used in fountain pens.
  2. 3. A dog loves to gnaw this.
  3. 5. She looks after patients in hospital.
Down
  1. 2. 3x3.
  2. 3. Puts money on a horse race.
  3. 4. Opposite of short.