COSMIST is a playable word

cosmist Scrabble® Dictionary

noun
pl. cosmists
a supporter of cosmism
76 Playable Words can be made from "COSMIST"
   2-Letter Words (11 found)
   3-Letter Words (23 found)
   5-Letter Words (11 found)
   6-Letter Words (3 found)
   7-Letter Words (2 found)