noun (n)

• a person who lacks confidence, is irresolute and wishy-washy(noun.person)

  Synonym:
  chicken, crybaby
  

  source: wordnet30
• a hypothetical subatomic particle of large mass that interacts weakly with ordinary matter through gravitation; postulated as a constituent of the dark matter of the universe(noun.object)

  Synonym:
  weakly interacting massive particle
  

  source: wordnet30