CONCHOIDS is a playable word

conchoid Scrabble® Dictionary

noun
pl. conchoids
a type of geometric curve
144 Playable Words can be made from "CONCHOIDS"
   2-Letter Words (15 found)
   6-Letter Words (10 found)
   7-Letter Words (3 found)
   8-Letter Words (1 found)
   9-Letter Words (1 found)