Hint: Nouns that start with 'a'
The answer to this puzzle is:
1. ACTIVITY
2. AUTHORITY
3. AMOUNT
4. ANKLE
5. ANTIDOTE
6. ANARCHY
7. ARCHERY
8. AGENT
9. AMATEUR
10. AGILITY
11. ARGUMENT
12. ASH
13. ARTICLE
2. AUTHORITY
3. AMOUNT
4. ANKLE
5. ANTIDOTE
6. ANARCHY
7. ARCHERY
8. AGENT
9. AMATEUR
10. AGILITY
11. ARGUMENT
12. ASH
13. ARTICLE