1. [n]  a combatant who is able to defeat rivals
2. [n]  the contestant who wins the contest

VICTOR is a 6 letter word that starts with V.

1. \Vic"tor\, n. [L. victor, fr. vincere, victum, to
   vanquish, to conquer. See {Vanquish}.]
   1. The winner in a contest; one who gets the better of
      another in any struggle; esp., one who defeats an enemy in
      battle; a vanquisher; a conqueror; -- often followed by
      art, rarely by of.
   
            In love, the victors from the vanquished fly; They
            fly that wound, and they pursue that die. --Waller.
   
   2. A destroyer. [R. & Poetic]
   
            There, victor of his health, of fortune, friends,
            And fame, this lord of useless thousands ends.
                                                  --Pope.
   
   

2. \Vic"tor\, a.
   Victorious. ``The victor Greeks.'' --Pope.