Hint: Things in motion
The answer to this puzzle is:
1. RIVER
2. SYRUP
3. CAR
4. GROWTH
5. ENGINE
6. INSECT
7. SOUND
8. WIND
9. CORAL
10. FAUCET
11. GLACIER
12. SCOOTER
13. WHEEL
2. SYRUP
3. CAR
4. GROWTH
5. ENGINE
6. INSECT
7. SOUND
8. WIND
9. CORAL
10. FAUCET
11. GLACIER
12. SCOOTER
13. WHEEL