Hint: Words that end in 'f'
The answer to this puzzle is:
1. HERSELF
2. DEBRIEF
3. STAFF
4. PAYOFF
5. RIPOFF
6. BELIEF
7. ITSELF
8. TARIFF
9. SHOWOFF
10. TAKEOFF
11. WHARF
2. DEBRIEF
3. STAFF
4. PAYOFF
5. RIPOFF
6. BELIEF
7. ITSELF
8. TARIFF
9. SHOWOFF
10. TAKEOFF
11. WHARF