Avengers

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Across
  1. 5. a star that explodes and becomes luminous in the process
  2. 7. forms of ceremony and etiquette observed by officials
  3. 8. one who lives through affliction
  4. 9. an offensive against an enemy
  5. 11. a sudden violent change in the earth's surface
  6. 13. a grand and imposing entrance
  7. 17. harming someone in retaliation for something they have done
  8. 20. an engine that causes a bladed rotor to rotate
  9. 21. projectiles to be fired from a gun
  10. 22. severely simple
Down
  1. 1. extremely impressive in strength or excellence
  2. 2. liable to lead to sudden change or violence
  3. 3. a standard or typical example
  4. 4. all the weapons and equipment that a country has
  5. 6. a scientist who studies the properties of celestial bodies
  6. 7. a state of extreme confusion and disorder
  7. 10. moving quickly and lightly
  8. 12. someone who takes action in return for an injury or offense
  9. 14. a powerful circular current of water
  10. 15. so surprised or shocked as to be unable to speak
  11. 16. time without end
  12. 18. the smallest discrete quantity of some physical property
  13. 19. a ceremonial or emblematic staff