SIXMOS is a playable word

sixmo Scrabble® Dictionary

noun
pl. sixmos
a paper size
34 Playable Words can be made from "SIXMOS"
   2-Letter Words (10 found)
   3-Letter Words (13 found)
   4-Letter Words (7 found)
   5-Letter Words (3 found)
   6-Letter Words (1 found)