What's the difference between those terms in relation to a road or air accident?
crash
verb
- (Aeronautics) to cause (an aircraft) to hit land or water violently resulting in severe damage or (of an aircraft) to hit land or water in this way
- (Automotive Engineering) to cause (a car, etc.) to collide with another car or other object or (of two or more cars) to be involved in a collision
noun
a collision, as between vehicles
(Aeronautics) a sudden descent of an aircraft as a result of which it hits land or water CED
wreck
noun An automobile or railroad collision or accident: witnessed a wreck on the highway.
verb To cause the destruction of in a collision: wrecked the car by hitting a tree. American Heritage® Dictionary
Please, compare the following examples:
His parents died in a car/plane crash.
His parents died in a car/plane wreck.
-and-
I crashed the car by hitting a tree.
I wrecked the car by hitting a tree.
-and-
The helicopter/truck crashed into their home.
The helicopter/truck wrecked into their home.
-and-
He witnessed a terrible crash on the highway.
He witnessed a terrible wreck on the highway.