Hurdle has the following meanings:-
1. As a noun, a barrier, an obstacle; (in steeplechase racing) a fence, a hedge, a wall: “After crossing the last hurdle, the racer fell unconscious on the ground.”
2. Another noun form, an obstacle or difficulty, a hindrance, an obstruction. ” Life is not a bed of roses; it is full of hurdles.”
3. As a verb it means to jump, to spring over, to clear: “The dog hurdled the gate and ran into the street.”
Hurtle, on the other hand, means to speed, to rush; to run quickly, to gallop; to go like the wind: “The car was hurtling along the road at hundred twenty km when it rammed into a stationery trolley.”