CYCLOID is a playable word

cycloid Scrabble® Dictionary

noun
pl. cycloids
a geometric curve
39 Playable Words can be made from "CYCLOID"
   2-Letter Words (8 found)
   3-Letter Words (10 found)
   4-Letter Words (16 found)
   5-Letter Words (4 found)
   7-Letter Words (1 found)