Regular List
1. school
2. wrote
3. phone
4. knew
5. sign
6. knots
7. wrong
8. knee
9. knife
10. wreck
11. wrap
12. knock
13. rough
14. laugh
15. elephant
16. cough
17. wren
18. writer
19. graph
20. track
Challenge List
1. angle
2. average
3. billion
4. century
5. decade
6. decimal
7. double
8. hundred
9. information
10. intercept
11. million
12. museum
13. resource
14. temperature
15. thousand
