O

O

1. ■ =object;

2. ■ observer;

3. ■ ocean;

4. ■ October;

5. ■ off;

6. ■ officer;

7. ■ Ohio;

8. ■ ohm;

9. ■ only;

10. ■ orange;

11. ■ order;

12. ■ ordinary;

13. ■ Oregon;

14. ■ oriental;

15. ■ oscillator;

16. ■ outlet;

17. ■ output;

18. ■ oxide-coated;

19. ■ oxygen