noun (n)

• a bully employed as a thug or bodyguard(noun.person)

  Example:
  The drug lord had his muscleman to protect him.
  

  Synonym:
  muscle
  

  source: wordnet30
• someone who does special exercises to develop a brawny musculature(noun.person)

  Synonym:
  bodybuilder, muscle builder, muscle-builder, musclebuilder
  

  source: wordnet30