Noun
1. revocation
3. cancellation
4. reversal
5. annulment
6. nullification
8. abolition
10. recall
Verb
11. revoke
12. rescind
13. cancel
14. reverse
15. annul
16. nullify
17. declare null and void
18. quash
19. abolish
20. vacate
21. abrogate
22. recall