Adding the prefix sub- (meaning ‘under’) and adding the prefix super- (meaning ‘above’)

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Across
  1. 1. A superhero who is very strong and can fly.
  2. 2. Having abilities stronger or better than a normal person.
  3. 3. An underground path or tunnel people walk through.
  4. 5. A person who is below someone else in rank or position.
  5. 7. A special underwater boat that can travel deep below the sea.
  6. 8. To watch over someone to make sure they are safe or doing something correctly.
Down
  1. 1. To replace something because it is newer or better.
  2. 2. To go under the surface of water.
  3. 4. A small title under a main heading to help organise information.
  4. 6. A special power or ability that a superhero might have.