OCTUPLEX is a playable word

octuplex Scrabble® Dictionary

adjective
being eight times as great
100 Playable Words can be made from "OCTUPLEX"
   2-Letter Words (14 found)
   5-Letter Words (13 found)
   6-Letter Words (2 found)
   7-Letter Words (2 found)
   8-Letter Words (1 found)