different between pileup vs crackup

English

pileup (plural pileups)

From the verb phrase crack up.

crackup (plural crackups)

A crash or wreck, generally involving a car or airplane.
- 1936, Joseph R. James, "More Gates Air Circus Antics" (Popular Aviation, November 1936)
  They shook the head of the unconscious pilot and when the latter opened his eyes, blinking wildly, the other members of the family lifted up the tail of the overturned crate sufficiently high enough to enable the dazed pilot, after releasing his belt, to fall out of the cockpit head first and disengage himself from the crack-up.

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