CYSTOID is a playable word

cystoid Scrabble® Dictionary

noun
pl. cystoids
a cyst-like structure
73 Playable Words can be made from "CYSTOID"
   2-Letter Words (13 found)
   3-Letter Words (26 found)
   5-Letter Words (8 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)