The Collaborative International Dictionary of English v.0.48:

Vaulter \Vault"er\, n.
   One who vaults; a leaper; a tumbler. --B. Jonson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vaulter
    n 1: an athlete who jumps over a high crossbar with the aid of a
         long pole [syn: vaulter, pole vaulter, pole jumper]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "vaulter":
   broad jumper, bucking bronco, buckjumper, flea, frog, gazelle,
   goat, grasshopper, high jumper, hopper, hurdle racer, hurdler,
   jackrabbit, jumper, jumping bean, jumping jack, kangaroo, leaper,
   pole vaulter, salmon, stag, sunfisher, timber topper