CONCHOID is a playable word

conchoid Scrabble® Dictionary

noun
pl. conchoids
a type of geometric curve
63 Playable Words can be made from "CONCHOID"
   2-Letter Words (10 found)
   3-Letter Words (23 found)
   4-Letter Words (18 found)
   5-Letter Words (8 found)
   6-Letter Words (3 found)
   8-Letter Words (1 found)