| nullifier | (n) an advocate of nullification; someone who believes that a state can resist federal laws |
| invalidator | (n) an official who can invalidate or nullify, Syn. voider, nullifier, Example: my bank check was voided and I wanted to know who the invalidator was |
| Nullifier | n. One who nullifies or makes void; one who maintains the right to nullify a contract by one of the parties. [ 1913 Webster ] |