COMPOS is a playable word

compo Scrabble® Dictionary

noun
pl. compos
a mixed substance
41 Playable Words can be made from "COMPOS"
   2-Letter Words (6 found)
   3-Letter Words (15 found)
   4-Letter Words (13 found)
   5-Letter Words (6 found)
   6-Letter Words (1 found)