Group A
1. absorb
2. accompany
3. accomplice
4. unusual
5. altercation
Group B
6. ambassador
7. ambiguous
8. agriculture
9. specific
10. apparatus
Group C
11. approximately
12. prisoner
13. authentic
14. authenticate
15. auxiliary
Group D
16. benevolent
17. blasphemous
18. acquiesce
19. vengeance
20. camouflage