voider

noun

1. a hamper that holds dirty clothes to be washed or wet clothes to be dried

   Synonym:    clothes hamperlaundry basketclothes basket

2. a piece of chain mail covering a place unprotected by armor plate

   Synonym:    gusset

3. a person who defecates

   Synonym:    defecatorshitter

4. an official who can invalidate or nullify
   1. my bank check was voided and I wanted to know who the invalidator was

   Synonym:    invalidatornullifier