1. overnight
2. bicycle
3. nonstop
4. overdue
5. overlook
6. biweekly
7. overflow
8. nonsense
9. oversee
10. overhead
11. nonfiction
12. overcoat
13. nonfat
14. overdone
15. biplane
16. overtaken
17. overheat
18. nonstick
19. nontoxic
20. overboard
