The suffix -ist

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Across
  1. 4. Hydrogen, helium, lithium, beryllium...
  2. 7. You when you have your solo performance
  3. 8. They know about brain power
  4. 11. Earth, that's it
  5. 12. Riding that motorcycle
  6. 14. The person to help you with mental problems
  7. 15. A guy who studies ________
  8. 16. Someone who cares for your teeth
Down
  1. 1. Harry Potter, Luke Skywalker etc.
  2. 2. Singing with your vocal skill
  3. 3. Studies sound
  4. 5. Studies weather and reports it on the news
  5. 6. The guy who studies life
  6. 9. The person who makes Mother's Day flowers
  7. 10. One who studies the one thing
  8. 13. Who makes paintings