FIVES is a 5 letter word that starts with F.

1. \Fives\ (f[imac]vz), n. pl.
   A kind of play with a ball against a wall, resembling tennis;
   -- so named because three fives, or fifteen, are counted to
   the game. --Smart.
   
   {Fives court}, a place for playing fives.
   
   

2. \Fives\, n. [See {Vives}.]
   A disease of the glands under the ear in horses; the vives.
   --Shak.