NOUN (1)

1. large hare of western North America;


VERB (1)

1. go forward or start with a fast, sudden movement;

WordNet (r) 3.0 (2006):

jackrabbit
    n 1: large hare of western North America
    v 1: go forward or start with a fast, sudden movement

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "jackrabbit":
   Belgian hare, broad jumper, buck, bucking bronco, buckjumper,
   bunny, cottontail, doe, flea, frog, gazelle, goat, grasshopper,
   hare, high jumper, hopper, hurdle racer, hurdler, jumper,
   jumping bean, jumping jack, kangaroo, lapin, leaper, leporide,
   leveret, pole vaulter, rabbit, salmon, stag, sunfisher,
   timber topper, vaulter