Words of Greek origin

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Across
  1. 3. Decorative handwriting
  2. 5. A widespread occurrence of an infectious disease
  3. 9. Simple
  4. 10. Maritime; concerning sailors or navigation
  5. 17. Feelings of sorrow for someone else
  6. 18. A postgraduate degree
  7. 19. Soft or kind; not harsh
  8. 20. To rule (as a country)
  9. 21. The science of behaviour & mind
  10. 22. A voice without intonation or changing pitch
Down
  1. 1. A group of singers
  2. 2. An inert gas commonly used in balloons
  3. 4. Infection causing cough fever & chest pain
  4. 6. The wealth & resources of a country
  5. 7. Sixty minutes
  6. 8. Used to make far objects seem near
  7. 9. Edible fat made from churned milk cream
  8. 11. A given amount of a drug
  9. 12. Something that represents something else
  10. 13. Fuel for cars
  11. 14. An eight-limbed mollusc
  12. 15. Material of books
  13. 16. Empty inside