CLASSIS is a playable word

classis Scrabble® Dictionary

noun
pl. classes
a governing body in certain churches
42 Playable Words can be made from "CLASSIS"
   2-Letter Words (7 found)
   3-Letter Words (12 found)
   4-Letter Words (12 found)
   5-Letter Words (7 found)
   6-Letter Words (3 found)
   7-Letter Words (1 found)