Obstacle
Part of speech: noun
Definition: Something that impedes, stands in the way of, or holds up progress
Hurdle
Part of speech: noun
Definition: An artificial barrier, variously constructed, over which men or horses jump in a race.A perceived obstacle.A movable frame of wattled twigs, osiers, or withes and stakes, or sometimes of iron, used for enclosing land, for folding sheep and cattle, for gates, etc.; also, in fortification, used as revetments, and for other purposes.In England, a sled or crate on which criminals were formerly drawn to the place of execution. —Francis Bacon.
Part of speech: verb
Definition: To jump over something while running.To compete in the track and field events of hurdles (e.g. high hurdles).To overcome an obstacle.