-er,-or,-ist - from Verb to Noun

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Across
  1. 2. - someone who uses their voice to sing
  2. 4. - someone who does the painting
  3. 5. - someone who does the jogging
  4. 6. - someone who plays the guitar
  5. 8. - someone who teaches
  6. 9. - someone who creates something
  7. 11. - the person who does the creating
Down
  1. 1. - someone who goes and explores
  2. 3. - someone who inspects things
  3. 7. - to create things
  4. 10. - another word for jogging or going fast
  5. 12. - using your voice