nullifier

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. an advocate of nullification;
someone who believes that a state can resist federal laws
• Derivationally related forms:
nullify
• Hypernyms:
advocate, advocator, proponent, exponent
2. an official who can invalidate or nullify
- my bank check was voided and I wanted to know who the invalidator was
• Syn:
invalidator, voider
• Derivationally related forms:
nullify, void (for: voider), invalidate (for: invalidator)
• Hypernyms:
official, functionary