-ary, -ery and -ory suffixes

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Across
  1. 5. A medical process that treats injuries or diseases
  2. 6. The antonym of optional
  3. 8. Helping to make suggestions
  4. 10. A place where young children are placed specially
  5. 14. Being alone
  6. 18. A synonym of courage
  7. 19. The method on how to do something
  8. 20. Investigating
Down
  1. 1. A set of words that someone knows
  2. 2. Marking the date of an important event
  3. 3. An antonym of real
  4. 4. A synonym of subordinate
  5. 7. Machines collectively
  6. 9. An antonym of abnormal
  7. 11. A synonym of acceptable
  8. 12. Something including things like names or telephone numbers
  9. 13. Relocating somewhere else
  10. 15. A good view, usually picturesque
  11. 16. A federal offense
  12. 17. Until a more permanent one is decided