Thayer's Greek Lexicon

 1. a crown
  1) a mark of royal or (in general) exalted rank
1a1. the wreath or garland which was given as a prize to
victors in public games
  2) metaph. the eternal blessedness which will be given as a
prize to the genuine servants of God and Christ: the crown
(wreath) which is the reward of the righteous
  3) that which is an ornament and honour to one

For Synonyms see entry G5833