SPEEDUP is a playable word

speedup Scrabble® Dictionary

noun
pl. speedups
an acceleration of production without an increase in pay
55 Playable Words can be made from "SPEEDUP"
   2-Letter Words (6 found)
   3-Letter Words (17 found)
   5-Letter Words (9 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)