UPSHIFTS is a playable word

upshift Scrabble® Dictionary

verb
upshifted, upshifting, upshifts
to shift into a higher gear
94 Playable Words can be made from "UPSHIFTS"
   2-Letter Words (12 found)
   3-Letter Words (28 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)