SEPTUPLING is a playable word

septuple Scrabble® Dictionary

verb
septupled, septupling, septuples
to make seven times as great
529 Playable Words can be made from "SEPTUPLING"
   2-Letter Words (20 found)
   3-Letter Words (86 found)
   8-Letter Words (7 found)
   10-Letter Words (1 found)