‘PS’ words

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Across
  1. 2. a mental doctor specialising in mental health
  2. 4. the scientific study of the human mind
  3. 5. a pen name for an author who doesn’t want to reveal there name
Down
  1. 1. The medical study and treatment of mental illness.
  2. 3. a sacred song or hymn or biblical poem
  3. 5. an expression of disbelief