CALLBACK is a playable word

callback Scrabble® Dictionary

noun
pl. callbacks
a recall of a defective product
35 Playable Words can be made from "CALLBACK"
   2-Letter Words (6 found)
   3-Letter Words (12 found)
   4-Letter Words (9 found)
   5-Letter Words (7 found)
   8-Letter Words (1 found)