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Across
  1. 3. A train that runs underground in a city.
  2. 4. A special ability that regular people do not have, like flying or invisibility.
  3. 5. Having powers or abilities that are stronger than normal people.
  4. 7. A famous superhero who is very strong and can fly.
  5. 8. To take the place of something older or less useful.
  6. 9. To watch over people and make sure they are doing things the right way.
Down
  1. 1. A ship that travels underwater.
  2. 2. A person who works under someone else and follows their instructions.
  3. 4. A smaller title that comes under a main heading and tells what the section is about.
  4. 6. To go completely under water or another liquid.