Solve the crossword, add suffixes er/or

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Across
  1. 1. farmer
  2. 4. inventor
  3. 6. builder
  4. 7. worker
  5. 8. director
  6. 10. selector
  7. 13. elector
  8. 15. driver
  9. 16. manager
  10. 17. server
Down
  1. 2. actor
  2. 3. reporter
  3. 4. instructor
  4. 5. conductor
  5. 6. baker
  6. 9. calculator
  7. 11. collector
  8. 12. writer
  9. 14. singer