CRACKUP is a playable word

crackup Scrabble® Dictionary

noun
pl. crackups
a collision
34 Playable Words can be made from "CRACKUP"
   2-Letter Words (4 found)
   3-Letter Words (15 found)
   4-Letter Words (11 found)
   5-Letter Words (3 found)
   7-Letter Words (1 found)