Word formation processes

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Across
  1. 3. attached to a wall or supported on an easel and used for writing on with chalk
  2. 6. is required to do at home
  3. 7. comb: a comb with narrow teeth that are close together
  4. 8. fog or haze combined with smoke and other atmospheric pollutants
  5. 13. give authorization or consent to (someone) to do something.
  6. 15. of furniture, produced especially in colonial America, that can serve,
  7. 17. a person who steals from other people's pockets
  8. 19. a system for transmitting visual images and sound that are reproduced on screens
  9. 20. a fat person
  10. 21. flat surface on which a straight line joining any two points
Down
  1. 1. sturdy cotton twill fabric, typically blue, used for jeans, overalls, and other clothing
  2. 2. a male homosexual
  3. 4. that is given to a charity, especially a sum of money
  4. 5. containing nothing; not filled or occupied
  5. 9. a mysterious object seen in the sky for which, it is claimed, no orthodox scientific explanation
  6. 10. recording: method of sound recording in which an input audio waveform
  7. 11. a box, room, or cabinet in which food, drink, etc
  8. 12. also called North Atlantic Treaty Organization
  9. 14. foolish or contemptible person who lacks social skills or is boringly studious
  10. 16. brother of one's wife or husband
  11. 18. means advertisement