CYSTOIDS is a playable word

cystoid Scrabble® Dictionary

noun
pl. cystoids
a cyst-like structure
94 Playable Words can be made from "CYSTOIDS"
   2-Letter Words (13 found)
   3-Letter Words (28 found)
   6-Letter Words (4 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)