noun (n)

• someone who is morally reprehensible(noun.person)

  Synonym:
  blackguard, bounder, dog, heel, hound
  

  source: wordnet30
• software used in art and architecture and engineering and manufacturing to assist in precision drawing(noun.communication)

  Synonym:
  computer-aided design
  

  source: wordnet30
• A person who stands at the door of an omnibus to open and shut it, and to receive fares; an idle hanger-on about innyards.(noun)

  source: webster1913