noun (n)

• a thin crisp wafer made of flour and water with or without leavening and shortening; unsweetened or semisweet(noun.food)

  source: wordnet30
• a poor White person in the southern United States(noun.person)

  Synonym:
  redneck
  

  source: wordnet30
• a programmer who cracks (gains unauthorized access to) computers, typically to do malicious things(noun.person)

  Example:
  Crackers are often mistakenly called hackers.
  

  source: wordnet30
• firework consisting of a small explosive charge and fuse in a heavy paper casing(noun.artifact)

  Synonym:
  banger, firecracker
  

  source: wordnet30
• a party favor consisting of a paper roll (usually containing candy or a small favor) that pops when pulled at both ends(noun.artifact)

  Synonym:
  cracker bonbon, snapper
  

  source: wordnet30
• One who, or that which, cracks.(noun)

  source: webster1913