word formation processes

3. attached to a wall or supported on an easel and used for writing on with chalk
4. sturdy cotton twill fabric, typically blue, used for jeans, overalls, and other clothing
5. give authorization or consent to (someone) to do something.
6. a mysterious object seen in the sky for which, it is claimed, no orthodox scientific explanation
8. a box, room, or cabinet in which food, drink, etc
10. a system for transmitting visual images and sound that are reproduced on screens
13. that is given to a charity, especially a sum of money
16. a person who steals from other people's pockets
18. recording: method of sound recording in which an input audio waveform
19. also called North Atlantic Treaty Organization
20. containing nothing; not filled or occupied

1. a fat person
2. of furniture, produced especially in colonial America, that can serve,
7. a male homosexual
9. foolish or contemptible person who lacks social skills or is boringly studious
11. fog or haze combined with smoke and other atmospheric pollutants
12. brother of one's wife or husband
14. is required to do at home
15. comb: a comb with narrow teeth that are close together
16. flat surface on which a straight line joining any two points
17. means advertisement