The silent 'P'

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Across
  1. 2. a sacred song, hymn or poem
  2. 5. a doctor who treats the mind
  3. 7. an illness of the lungs
  4. 8. a signed piece of paper proving you have paid for something
  5. 9. something used to help you remember something (SQRW)
Down
  1. 1. a person who can read minds
  2. 3. the study of the mind
  3. 4. an extinct flying reptile
  4. 6. an invented name used by a writer
  5. 7. a poison released by decaying matter