SEXTUPLING is a playable word

sextuple Scrabble® Dictionary

verb
sextupled, sextupling, sextuples
to make six times as great
525 Playable Words can be made from "SEXTUPLING"
   2-Letter Words (23 found)
   3-Letter Words (92 found)
   8-Letter Words (3 found)
   9-Letter Words (1 found)
   10-Letter Words (1 found)