Thayer's Greek Lexicon

 1. servant
  1) an underrower, subordinate rower
  2) any one who serves with hands: a servant
1b1. in the NT of the officers and attendants of
magistrates as -- of the officer who executes penalties
1b2. of the attendants of a king, servants, retinue, the
soldiers of a king, of the attendant of a synagogue
1b3. of any one ministering or rendering service
  3) any one who aids another in any work
1c1. an assistant
1c2. of the preacher of the gospel

For Synonyms see entry G5834