nullifier

Noun
  1. An advocate of nullification;
    Someone who believes that a state can resist federal laws (synset 110385683)
    is a type of: advocate, advocator, exponent, proponent - a person who pleads for a cause or propounds an idea
  2. An official who can invalidate or nullify (synset 110234060)
    "my bank check was voided and I wanted to know who the invalidator was"
    is a type of: functionary, official - a worker who holds or is invested with an office
    same as: invalidator, voider

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