English to English

noun (n)

• an aggressive and violent young criminal(noun.person)

  Synonym:
  goon, hood, hoodlum, punk, strong-armer, thug, tough
  

  source: wordnet30
• a particularly difficult or baffling question or problem(noun.communication)

  Synonym:
  poser, sticker, stumper
  

  source: wordnet30