noun (n)

• someone (a person or firm) who contracts to build things(noun.person)

  source: wordnet30
• the bridge player in contract bridge who wins the bidding and can declare which suit is to be trumps(noun.person)

  Synonym:
  declarer
  

  source: wordnet30
• (law) a party to a contract(noun.person)

  source: wordnet30
• a bodily organ that contracts(noun.body)

  Synonym:
  contractile organ
  

  source: wordnet30
• One who contracts; one of the parties to a bargain; one who covenants to do anything for another; specifically, one who contracts to perform work on a rather large scale, at a certain price or rate, as in building houses or making a railroad.(noun)

  source: webster1913